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[thirdparty/squid.git] / ChangeLog

        - Added 'max-conn' option to 'cache_peer'

Changes to squid-2.5
        - Major rewrite of proxy authentication to support other schemes
          than basic. First in the line is NTLM support but others can
          easily be added (digest is on the way). See Programmers Guide.
          (Robert Collins & Chemolli Francesco)
        - Reworked how request bodies are passed down to the protocols.
          Now all client side processing is inside client_side.c, and
          the pass and pump modules is no longer used.
        - Optimized searching in proxy_auth and ident ACL types. Should
          now handle large access lists a lot more efficient.
          (Francesco Chemolli)
        - Fixed forwarding/peer loop detection code (Brian Degenhardt) -
          now a peer is ignored if it turns out to be us, rather than
          committing suicide
        - Changed the internal URL code to obey appendDomain for internal
          objects if it needs appending. This fixes weirdnesses where
          a machine can think it is "foo.bar.com", and "foo" is requested.
          (Brian Degenhardt)
        - Added support for netfilter in linux-2.4. This allows transparent
          proxy connections to function correctly in the absence of a Host:
          header. This requires --enable-linux-netfilter to be passed through
          to configure. (Evan Jones)

Changes to Squid-2.4.DEVEL4 ():

        - Added --enable-auth-modules=... configure option
        - Improved ICP dead peer detection to also work when the workload
          is low
        - Improved TCP dead peer detection and recovery
        - Squid is now a bit more persistent in trying to find a alive
          parent when never_direct is used.
        - nonhierarchical_direct squid.conf directive to make non-ICP
          peer selection behave a bit more like ICP selection with respect
          to hierarchy.
        - Bugfix where netdb selection could override never_direct
        - ICP timeout selection now prefers to use parents only when
          calculating the dynamic timeout to compensate for common RTT
          differences between parents and siblings.
        - No longer starts to swap out objects which are known to be above
          the maximum allowed size.
        - allow-miss cache_peer option disabling the use of "only-if-cached".
          Meant to be used in conjunction with icp_hit_stale.
        - Delay pools tuned to allow large initial pool values
        - cachemgr filesystem space information changed to show useable space
          rather than raw space, and platform support somewhat extended.
        - Logs destination IP in the hierarchy log tag when going direct.
          (can be disabled by turning log_ip_on_direct off)
        - Async-IO on linux now makes proper use of mutexes. This fixes some
          odd pthread segfaults on SMP Linux machines, at a slight performance
          penalty.
        - %s can now be used in cache_swap_log and will be substituded with
          the last path component of cache_dir.
        - no_cache is now a full ACL check without, allowing most ACL types
          to be used.
        - The CONNECT method now obeys miss_access requirements
        - proxy_auth_regex and ident_regex ACL types
        - Fixed a StoreEntry memory leak during "dirty" rebuild
        - Helper processes no longer hold unrelated filedescriptors open
        - Helpers are now restarted when the logs are rotated
        - Negatively cached DNS entries are now purged on "reload".
        - PURGE now also purges the DNS cache
        - HEAD on FTP objects no longer retreives the whole object
        - More cleanups of the dstdomain ACL type
        - Squid no longer tries to do Range internally if it is not supported
          by the origin server. Doing so could cause bandwidth spikes and/or
          negative hit ratio.
        - httpd_accel_single_host squid.conf directive
        - "round-robin" cache_peer counters are reset every 5 minutes to
          compensate previously dead peers
        - DNS retransmit parameters
        - Show all FTP server messages
        - squid.conf.default now indicates if a directive isn't enabled in
          the installed binary, and what configure option to use for enabling it
        - Fixed a temporary memory leak on persistent POSTs
        - Fixed a temporary memory leak when the server response headers
          includes NULL characters
        - authenticate_ip_ttl_is_strict squid.conf option
        - req_mime_type ACL type
        - A reworked storage system that supports storage directories in
          a more modular fashion. The object replacement and IO is now
          responsibility of the storage directory, and not of the storage
          manager.
        - Fixed a bogous MD5 mismatch warning sometimes seen when using
          aufs or diskd stores
        - Added --enable-stacktraces configure option to set PRINT_STACK_TRACE,
          and extended support for this to Linux/GNU libc.
        - Disabled the "request timeout" error message sent if the user agent
          did not provide a request in a timely manner after opening the
          connection. Now the connection is silently closed. The error message
          was confusing user agents utilizing persistent connections.
        - Fixed configure --enable descriptions to match the arg names.
        - Eliminated compile warnings from auth_modules/MSNT code.
        - Require first character of hostnames to be alphanumeric.
        - Made ARP ACL work for Solaris.
        - Removed storeClientListSearch().
        - Added counters to track diskd operation success and
          failures.
        - Fixed range_offset_limit.
        - Added code to retry ServFail replies for internal DNS
          lookups.
        - Added referer header logging (Jens-S. Voeckler).
        - Added "multi-domain-NTLM" authentication module, a Perl
          script from Thomas Jarosch.
        - Added configurable warning messages for high memory usage,
          high response time, and high page faults.
        - Made store dir selection algorithm configurable.
        - Added support for admin-definable extension methods,
          up to 20.
        - Added 'maximum_object_size_in_memory' as a configuration option -
          this defines the watermark where objects transit from being true
          hot objects to being in-transit objects in memory. It currently
          defaults to 8 KB.
        - Change to the fqdn code which changes how pending DNS requests
          are treated as private and only become public once they are
          completed. This can add extra load on DNS servers but prevents
          all the pending clients blocking if one of the queries got
          stuck. (Duane Wessels)
        - Converted more code to use MemPools, from Andres Kroonmaa.
        - Added more CYGWIN patches from Robert Collins.

Changes to Squid-2.4.DEVEL3 ():

        - Added Logfile module.
        - Added DISKD stats via cachemgr.
        - Added squid.conf options for DISKD magic constants.

Changes to Squid-2.4.DEVEL2 (Feb 29, 2000):

Changes to Squid-2.4.DEVEL1 ():

Changes to Squid-2.3.STABLE4 (July 18, 2000):

        - Fixed --localstatedir configure option (IKEDA Shigeru).
        - Fixed IPFilter headers on OpenBSD (Nic Bellamy, Brad
          Smith).
        - Added pthread_sigmask() check to configure (Daniel
          Ehrlich).
        - Added CYGWIN patches from Robert Collins.
        - Changed internal DNS lookups to retry queries that are
          returned with RCODE 2 (ServFail).
        - Added 'virtual port' support (Gregg Kellogg).  If
          'httpd_accel_uses_host_header' is enabled, then we use
          the port number from the Host header.  Otherwise, when
          'httpd_accel_port' is set to "0" we use the port number
          of the local end of the client socket.
        - Fixed a typo in carp.c (Nikolaj Yourgandjiev).
        - Made Squid accept GET requests that have a "content-length:
          0" header.
        - Added a sanity check on the NHttpSockets[] array index
          (Gregg Kellogg).
        - Added a friendlier message when Squid can't find any DNS
          nameserver addresses to use (Daniel Kiracofe).
        - Added nonstandard WEBDAV methods: BMOVE, BDELETE, BPROPFIND
          (Craig Whitmore).
        - Added missing '%c' token replacement in error page
          generation.
        - Fixed a bug with 'minimum_object_size' that prevented
          internal icons from being loaded.
        - Fixed "extra semicolon" bug in storeExpiredReferenceAge()
          that could prevent any objects from being replaced.
        - Make sure that storeDirDiskFull() doesn't actually
          *increase* the cache size.
        - Changed a storeSwapMetaUnpack() assertion to a recoverable
          error condition.
        - Removed "wccpHereIam" event check that could cause Squid
          to stop sending HERE_I_AM messages.

Changes to Squid-2.3.STABLE3 (May 15, 2000):

        - Fixed malloc linking problems on Solaris.  The configure
          script incorrectly set options for dlmalloc.
        - Added a configure check to remove compiler optimization
          for GCC 2.95.x.
        - Updated MSNT authenticator module.
        - Updated Estonian error pages.
        - Updated Japanese error pages.
        - Fixed expires bug in httpReplyHdrCacheInit.  It was
          incorrectly setting expires based on max-age.  It was using
          the current time as a basis, instead of the response date.
        - Fixed "USE_DNSSERVER" typos.
        - Added a workaround for getpwnam() problems on Solaris.
          getpwnam() could fail if there are fewer than 256 FDs
          available.  This causes root to own some disk files.
        - Added an 'offline_toggle' option via the cache manager.
        - Added a 'minimum_object_size' option.  Files smaller than
          this size are not stored.
        - Added 'passive_ftp' option to disable passive FTP transfers.
        - Added 'wccp_version' option because some Cisco IOS versions
          require WCCP version 3.
        - The 'client' program in ping mode (-g) now prints transfer
          throughput.
        - Fixed logging of proxy auth username for redirected
          requests.
        - Fixed bogus Age values for IMS requests.
        - Fixed persistent connection timeout for client-side
          connections.  It was hard-coded to 15 seconds, now uses
          the 'pconn_timeout' value.
        - Fixed up httpAcceptDefer.  It wasn't being used properly
          and caused high CPU usage when Squid gets close to the FD
          limit.
        - Numerous delay_pools fixes and checks.
        - Fixed SNMP coredumps from running snmpwalk.
        - Added a check for errno == EPIPE in icmp.c when pinger uses
          a Unix socket instead of a UDP socket.
        - Fixed ACL checklist memory initialization bugs.
        - Cleaned up the MIB file.  Replaced contact information and
          checked description fields.
        - Removed LRU reference_age hard-coded upper limit.
        - Fixed async I/O FD leak.
        - Made getMyHostname() more robust.
        - Fixed domain list matching bug.  "x-foo.com" wasn't properly
          compared to ".foo.com" and confused splay tree ordering.
        - Added a check for whitespace in hostnames and optionally
          strip whitespace if 'uri_whitespace' setting allows.
        - Added status code and checking to ASN/whois queries.

Changes to Squid-2.3.STABLE2 (Mar 2, 2000):

        - Changed Copyright text.
        - Changed configure so that some IRIX-6.4 hacks apply to
          all IRIX-6.* versions.
        - Cleaned up HTML bugs in error pages.
        - Told configure to check for netinet/if_ether.h, which
          is used in ARP ACL code, but might not be required.
        - Added "Cookie" to known HTTP headers so it can be
          used in anonymizer configuration.
        - Added optional TCP_REDIRECT log code for logging
          of 301/302 responses returned by Squid.
        - Added a check for a currently running Squid process.
          If the pid file exists, and the pid is running,
          Squid complains and refuses to start another instance.
        - Changed async I/O scope to PTHREAD_SCOPE_PROCESS for
          IRIX.
        - Fixed a bug with the PURGE method.  The purge enable
          flag was not getting cleared during reconfigure.
          Also required PURGE method to be used in http_access
          list before enabling.
        - Fixed async I/O assertions for file open errors.
        - Fixed internal DNS assertion when unpacking truncated
          messages.
        - Fixed anonymize_headers bug that caused all headers
          to be allowed after a reconfigure.
        - Fixed an access denied bug for accelerator-only installations.
        - Fixed internal DNS initialization so that it uses
          'dns_nameservers' settings in squid.conf if set.
        - Fixed 'maxconn' ACL bug that caused it to work backwards
          (Pedro Ribeiro).
        - Fixed syslog bug for daemon mode on Linux.
        - Fixed 'http_port' parsing bugs.
        - Fixed internal DNS byte ordering bugs for PTR queries.
        - Fixed internal DNS queue getting stuck during periods
          of low activity (Henrik).
        - Fixed byte ordering bugs for parsing EPLF FTP listings
          on 64-bit systems.
        - Fixed 'request_body_max_size' bug that caused all
          POST, PUT requests to be denied if max size is set
          to zero.
        - Fixed 'redirector_access' bug when using 'myport' ACLs.
        - Fixed CARP neighbor selection bugs for down peers.
        - Added 'client_persistent_connections' and
          'server_persistent_connections' flags to disable persistent
          connections for clients and servers.
        - Fixed access logging bug that caused many requests to be
          logged as TCP_MISS.
        - Added some bounds checking to delay pools code.

Changes to Squid-2.3.STABLE1 (Jan 9, 2000):

        - Updated PAM authentication module from Henrik Nordstrom.
        - Updated Bulgarian error messages from Svetlin Simeonov.
        - Changed ACL routines so that User-Agent (browser) string
          is always taken from compiled HTTP request headers
          instead of passed as an argument to aclCreateChecklist.
        - Added a 'strip' option to the 'uri_whitesace' configuration
          directive and made it the default behavior.  Whitespace
          found in URI's is now stripped out by default.
        - Added chroot feature.  The 'chroot_dir' config option enables
          it and specifies the directory.
        - Changed clientBuildReplyHeader so that the Age header is
          added only for cache hits, and only when we can calculate
          a valid, positive age value.
        - Changed clientWriteComplete and clientGotNotEnough so
          that they keep persistent connections open for more types
          of replies that don't have bodies.
        - Changed filemap.c routines to dynamically grow filemap
          space as needed.
        - Added a hack to ftp.c to deal with ftp.netscape.com, which
          sometimes doesn't acknowledge PASV commands.
        - Fixed FTP bug with ftpScheduleReadControlReply; there
          was not always a timeout handler on the control socket
          after the transfer completed.
        - Fixed FTP filedescriptor leak from invalid PASV replies.
        - Changed httpBuildRequestHeader so that it doesn't
          copy the Host header from the client request.  Instead
          we should generate our own Host header which is known
          to be correct.
        - Changed storeTimestampsSet to adjust entry->timestamp
          if the response includes an Age header.
        - Removed size limit from storeKeyHashBuckets.
        - Changed fwdConnectStart from a "heavy" to a "light" event.
        - Fixed an 'anonymize_headers' bug that affects unknown
          HTTP headers.  With the bug, if you list a header that
          Squid doesn't know about (such as "Charset"), it would
          add HDR_OTHER to the allow/deny mask.  This caused all
          unknown headers to be allowed or denied (depending on
          the scheme you use).  Now, with the bug fixed, an unknown
          header in the 'anonymize_headers' list is simply ignored.

Changes to Squid-2.3.DEVEL3 ():

        - Added MSNT auth module from Antonino Iannella.
        - Added --enable-underscores configure option.  This allows
          Squid to accept hostnames with underscores in them.  Your
          DNS resolver may still complain about them, however.
        - Added --heap-replacement configure option.  This enables
          the alternative cache replacement policies, such as
          GDSF, and LFUDA.
        - WCCP establishes and registers with the router faster.        
        - Added 'maxconn' acl type to limit the number of established
          connections from a single client IP address.  Submitted
          by Vadim Kolontsov.
        - Close FTP data socket as soon as transfer completes
          (Alexander V. Lukyanov).
        - Fixed ftpReadPass() to not clobber ctrl.message when
          the PASS command fails.
        - Added a redirect.c patch so squidGuard is able to do
          per-user access control (Antony T Curtis).
        - discard the pumpMethod() function, and instead use the
          fact that the request has a request entity (content-length
          present) (Henrik).
        - Reload the MIME icons at reconfigure time (Radu Greab).
        - Updated Richard Huveneers' SMB authentication module to
          his version 0.05 package.
        - Fixed lib/heap.c::heap_delete() bug when deleting the
          last node.
        - Fixed an integer conversion bug in
          lib/rfc1035.c::rfc1035AnswersUnpack().
        - Fixed lib/rfc1738 routines to encode reserved characters,
          in addition to encoding the unsafe characters (Henrik).
        - Changed the interface for splay compare and "walk"
          functions to take a void pointer, instead of a splayNode
          pointer (Henrik).
        - Changed numerous HTTP parsing routines to use ssize_t
          instead of size_t.  This was done because size_t may be
          signed or unsigned.  When it is unsigned, gcc emits
          numerous "comparison is always true" warnings.  At least
          we know ssize_t is always signed.
        - Fixed src/HttpHeaderTools::httpHeaderHasConnDir() and
          friends so that it properly handles multi-value lists.
        - Added an "end" (ssize_t) parameter to
          src/HttpReply::httpReplyParse() so that we know exactly
          where to terminate the header buffer.
        - Changed src/access_log.c::log_quote() so that it only
          encodes whitespace characters, and not all URL-special
          characters (Henrik).
        - Added local port ACL type ("myport") (Henrik).
        - Added maximum number of connections per client ("maxconn")
          as an ACL type.
        - Fixed proxy authentication username/password parsing to
          be more robust (Henrik).
        - Fixed ACL domain/host and domain/domain comparison
          functions yet again.  Eliminated duplicate code so that
          only src/url.c::matchDomainName() contains this mysterious
          code.
        - Changed the 'http_port' option to accept an IP address
          or hostname as well (Henrik).
        - Removed 'tcp_incoming_addr' option.
        - Added an access control list for the redirector
          ('redirector_access').  Requests which match are sent to
          the redirector.  All requests. are redirected by default.
        - Added the 'authenticate_ip_ttl' option.  It specifies
          how long a valid proxy authentication credential is
          bound to a specific address.
        - Added 280, 488, 591, and 777 to "Safe_ports" ACL.
        - Removed the unused and highly questionable 'forward_snmpd_port'
          option.
        - Added an option to accept DNS messages from unknown nameservers.
          This may be necessary if replies come from a different address
          than queries are sent to.
        - Added #includes for IP Filter files in netinet directory.
        - Fixed a bug with retrying forwarded IMS requests (Henrik).
        - Fixed a bug in src/client_side.c::clientInterpretRequestHeaders()
          where we were checking a cache-control bit before getting the
          mask from the HTTP headers (pallo@initio.no).
        - Fixed a bug with "no_cache" access list.  If not defined,
          everything was uncachable by default.
        - Fixed a bug with timed-out client-side HTTP connections.
          We didn't cancel the read handler, which could lead to 
          "rwstate != NULL" warnings.
        - Changed comm_open() to only call fdAdjustReserved() for
          specific errors (ENFILE, EMFILE);
        - Fixed NULL pointer bug in idnsParseResolvConf().
        - Split CACHE_DIGEST_HIT into CD_PARENT_HIT and CD_SIBLING_HIT.
        - Added DELETE request method.
        - Added RFC 2518 HTTP status codes.
        - Fixed handling of URL passwords when we need to rewrite a
          BASE HREF URL (Henrik).
        - Fixed a bug with FTP requests where a request gets aborted,
          but we try to complete it anyway.  It would result in a
          "store_status != STORE_PENDING" assertion.  The solution
          is to check for ENTRY_ABORTED before reading from
          the control channel too.
        - Changed FTP to retry a request if Squid fails to establish
          a PASV data connection (Henrik).
        - Fixed numerous HTCP memory leaks and an uninitialized memory
          bug.
        - Changed httpMaybeRemovePublic() with RFC 2518 and 2616 in
          mind (Henrik).
        - Minor fixes for Rhapsody systems.
        - Define _XOPEN_SOURCE_EXTENDED in squid.h so that AIX systems
          don't include varargs.h.
        - Changed src/store_client.c::storeClientType() so that
          an entry can have more than one STORE_MEM_CLIENT.
        - Changed src/store_client.c::storeClientReadHeader()
          to check swapfile metadata (Henrik).
        - Changed src/url.c::urlCheckRequest() to return FALSE for
          any "https://" URL.  These should always be CONNECT
          instead.  If Squid gets an "https://" URL, it is a browser
          bug.
        - Added numerous squid.conf options for controlling cache
          digests.   Previously these were hard-coded in
          src/store_digest.c.  (Martin Hamilton)
        - Added 'cache_peer' option called 'digest-url' that
          lets you specify the URL for a peer's digest.
          (Martin Hamilton)
        - Added DELAY_POOLS hacks to scan "slow" connections in
          a random order (David Luyer).
        - ARP_ACL fixes from Damien Miller.  Linux 2.2.x uses a
          per-interface arp/neighbour cache, whereas 2.0.x uses a
          unified cache. Under 2.2.x you are required to specify
          a interface name when looking up ARP table entries with
          SIOCGARP.
        - If the process umask is not set (i.e. 0), then Squid
          changes it to 007.

Changes to Squid-2.3.DEVEL2 ():

        - Added --enable-truncate configure option.
        - Updated Czech error messages ()
        - Updated French error messages ()
        - Updated Spanish error messages ()
        - Added xrename() function for better debugging.
        - Disallow empty ("") password in aclDecodeProxyAuth()
          (BoB Miorelli).
        - Fixed ACL SPLAY subdomain detection (again).
        - Increased default 'request_body_max_size' from 100KB
          to 1MB in cf.data.pre.
        - Added 'content_length' member to request_t structure
          so we don't have to use httpHdrGetInt() so often.
        - Fixed repeatedly calling memDataInit() for every reconfigure.
        - Cleaned up the case when fwdDispatch() cannot forward a
          request.  Error messages used to report "[no URL]".
        - Added a check to return specific error messages for a
          "store_digest" request when the digest entry doesn't exist
          and we reach internalStart().
        - Changed the interface of storeSwapInStart() to avoid a bug
          where we closed "sc->swapin_sio" but couldn't set the
          pointer to NULL.
        - Changed storeDirClean() so that the rate it gets called
          depends on the number of objects deleted.
        - Some WCCP fixes.
        - Added 'hostname_aliases' option to detect internal requests
          (cache digests) when a cache has more than one hostname
          in use.
        - Async I/O NUMTHREADS now configurable with --enable-async-io=N
          (Henrik Nordstrom).
        - Added queue length to async I/O cachemgr stats (Henrik Nordstrom).
        - Added OPTIONS request method.

Changes to Squid-2.3.DEVEL1 ():

        - Added WCCP support.  This adds the 'wccp_router' squid.conf
          option.
        - Added internal DNS queries; Most installations can run
          without the external dnsserver processes.
        - Rewrote much of the code that stores cache objects on
          disk.  Developed a programming interface that should
          allow new storage systems to be added easily.  This still
          is pretty ugly and needs a lot of work, however.
        - Replaced async_io.c "tags" with callback data locks.
          This probably breaks async IO in a bad way.
        - Tried to write an Async IO disk storage module.
        - Added code to replace the StoreEntry linked list with a
          heap structure.  This allows for different replacement
          algorithms, instead of being stuck with LRU.  This adds
          the 'replacement_policy' squid.conf option. (John Dilley
          et al).
        - Fixed HTCP queries by actually checking for freshness
          based on the HTCP header fields.
        - Fixed passing of redirector command line arguments.
        - Added 'request_header_max_size' squid.conf option.
        - Added 'request_body_max_size' squid.conf option.
        - Added 'reply_body_max_size' squid.conf option.
        - Added 'peer_connect_timeout' squid.conf option.
        - Added 'redirector_bypass' squid.conf option.
        - Added RFC 2518 (WEBDAV) request methods.
        
Changes to Squid-2.2 (April 19, 1999):

        - Removed all SNMP specific ACL code
          SNMP now uses generic squid ACL's
        - Removed view-based access crontrol
        - Cleaned up and simplified SNMP section of squid.conf
        - Changed the SNMP code to use a tree stucture.
        - Added objects to MIB: 
                Request Hit Ratio's
                Byte Hit Ratio's
                Number of Clients
        - Changed SNMP Agent to return object instances correctly.
        - Added our own assert() macro so we can use debug() instead of
          printing to stderr.
        - Added eventFreeMemory().
        - Fixed ipcCreate() bug when debug_log has FD <= 2.
        - Changed watchChild() and related code in main.c so that
          Squid can behave more like a proper daemon process.
        - Added 'prefer_direct' option (enabled by default) so that
          people can give parents higher preference than direct.
        - Fixed ipc.c close() bug for async IO.  On FreeBSD,
          comm_close() doesn't work for child processes when async IO is
          used.
        - Fixed setting the public key for large ``icons'' (Henrik
          Nordstrom).
        - Rewrote peer digest module to fix memory leaks on reconfigure
          and clean the code. Increased "current" digest version to 5
          ("required" version is still 3). Revised "Peer Select" cache 
          manager stats.
        - Added "-k parse" command line option: parses the config file
          but does not send a signal unlike other -k options.
        - Revamped storeAbort() calling.  Only store_client.c has all
          the right information to determine if the request should
          be aborted.  Now client and server modules just storeUnregister
          without ever needing to call storeAbort.
        - Small change of Squid output for FTP (Andrew Filonov,
          Henrik Nordstrom).
        - clientGetsOldEntry() sends old entry if new request status
          is in the 500-range (Henrik Nordstrom).
        - Changed configure so it works with IRIX6.4 C compiler (broken?)
          option -OPT:fast_io=ON.
        - Fixed comm_connect_addr() non-blocking connections for
          SONY NEWSOS (Makoto MATSUSHITA).
        - Changed "#ifdef __STDC__" to "#if STDC_HEADERS" as recommended
          by autoconf documentation.
        - Fixed client-side cache-control max-age (Henrik Nordstrom).
        - Added a new error page: ERR_SHUTTING_DOWN.  fwdStart() returns
          this error if it is called while squid is in the process of
          shutting down.
        - Added support for linuxthreads package under FreeBSD (Tony Finch).
        - Fixed HP-UX StatHist.c assertions by making the "hbase_f"
          functions non-static (Michael Pelletier).
        - Fixed logging of authenticated usernames even if the
          authorization is not cached (Dancer).
        - Fixed pconnPush() bug that prevented holding on to
          persistent connections (Manfred Bathelt).
        - Pid file now rewritten on SIGHUP.
        - Numerous Ident changes:
                - Ident lookups will now be done on demand if you use the
                  'ident' ACL type.
                - The 'ident_lookup on|off' option has been replaced with
                  an access list, so you can do lookups only for some
                  client addresses.
                - Added an 'ident_timeout' option to specifiy the amount
                  of time to wait for an ident lookup.
        - Added a (local) hit rate to mempool metering.
        - FTP Restarts (REST command) is now supported.
        - Check for libintl.a on SCO3.2.
        - Disable poll() on SCO3.2.
        - Numerous Async IO enhancements from Henrik.
        - Removed cache_mem_low and cache_mem_high options (Henrik
          Nordstrom).
        - Replaced 'persistent_client_posts' with 'broken_posts' access
          list.
        - Rewrote the anonymizer.
        - Removed the http_anonymizer option.
        - Added the anonymize_headers option to allow individual
          referencing of headers for addition or removal. See
          'anonymize_headers' in squid.conf for additional
          configuration.
        - Fixed config file parser's handing of optional directives.
          Some people might get new warnings about unknown config
          directives.
        - Added 'myip' ACL type.  This is the local IP address for
          connected sockets (Luyer).
        - Fixed parsing of FTP DOS directory listings with spaces
          (Nordstrom).
        - Numerous DELAY_POOL changes/fixes from David Luyer:
                - Makes no-delay neighbors for DELAY_POOLS work by
                  using a fd_set with the connections to no-delay
                  peers marked in it.
                - Makes IP addresses ending in 0 and 255, and
                  network number 255, work with individual and
                  network delay pools (they were previously not
                  permitted, and documented as such).
                - Massive overhaul of delay pools code - dynamically
                  allocated delay pools, as many as required.
                - delayPoolsUpdate stops running if DELAY_POOLS is
                  configured but no delay pools are configured.
                - Initial delay pool levels are now configurable
                  as a percentage of the maximum for the pool in
                  question (used to be all set to 1 second worth
                  of traffic).  Pools are restored to this level
                  on reconfiguratoin.
        - Changed storeClientCopy to give a swap-in failure if 
          the number of open disk FD's is above the 'max_open_disk_fds'
          limit.  Otherwise, a very loaded cache will end up with
          all disk files open for reading, and none for writing.
        - Added lib/inet_ntoa.c from BSD Unix for systems that have
          broken inet_ntoa().  (Erik Hofman).
        - Added more specific FTP error messages for "permission
          denied, "file not found," and "service unavailable."
          (Tony Finch)
        - Added xisspace(), xisdigit(), etc, macros to cast function
          args and eliminate compiler warnings.
        - Fixed case-sensitive comparisons of domain names (Henrik
          Nordstrom).
        - Added proxy-authentication to cachemgr.cgi's requests
          (Henrik Nordstrom).
        - Changed Squid to *truncate* rather than *unlink* purged
          swap files.  Can be reversed by undefining 
          USE_TRUNCATE_NOT_UNLINK in src/defines.h.
        - Changed internal icon headers to use Cache-control
          Max-age instead of Expires.
        - Changed storeMaintainSwapSpace behavior to be adjusted
          smoothly, instead of discretely, between store_swap_low
          and store_swap_high.  This includes the number of
          objects to scan, number to remove, and time until the
          next storeMaintainSwapSpace event.
        - Fixed a quick_abort bug that incorrectly calculated
          content lengths.
        - Added getpwnam() auth module from Erik Hofman.
        - Added 'coredump_dir' option.
        - Fixed a peerDestroy() assertion that required peer->digest
          to be NULL at the end of peerDestroy().
        - configure script now automatically enables dlmalloc for
          Solaris/x86.
        - configure enables poll() on linux 2.2 and later (Henrik).
        - Icon files are now distributed in binary format, install
          will not need to run 'sh' and 'uudecode'.
        - Fixed some bugs with large responses (>READ_AHEAD_GAP) and
          re-forwarding requests and ENTRY_FWD_HDR_WAIT.
          fwdCheckDeferRead() will NOT defer reading if the
          ENTRY_FWD_HDR_WAIT bit is set.
        - Fixed a "F->flags.open" assertion for aborted FTP PUT's.
        - Fixed a (double) cast problem that caused statAvgTick()
          events to be added as fast as possible.
        - Changed httpPacked304Reply() to not include the Content-Length
          header for 304 replies that Squid generates.  We used to
          include the length of the cached object, and this broke
          persistent connections.

        2.2.STABLE2:

        - Fixed configure bug for statvfs() checks.  Configure reports
          "test: =: unary operator expected" or similar because an
          unquoted variable is not defined.
        - Fixed aclDestroyAcls() assertion because some ACL types
          are not listed in the switch statement.  Occurs for
          srcdom_regex and dstdom_regex ACL types during reconfigure.
        - Typo "applicatoin" in src/mime.conf
        - The unlinkd daemon never saw the USE_TRUNCATE_NOT_UNLINK
          #define because it didn't include squid.h.
        - Fixed commRetryFD() when bind() fails.   commRetryFD was
          closing the filedescriptor, but it is the upper layer's
          job to close it.
        - Changed configure's "maximum number of filedescriptors"
          detection to only use getrlimit() for Linux.  On AIX,
          getrlimit returns RLIM_INFINITY.
        - Fixed snmpInit() nesting bug.
        - Fixed a bug with peerGetSomeParent().  It was adding
          a parent to the FwdServers list, regardless of the
          ps->direct value.  This could cause every request to
          go to a parent even when always_direct is used.
        - Changed fwdServerClosed() to rotate the "forward servers"
          list when a connection establishment fails.  Otherwise
          it always kept trying to connect to the first server
          int the list.

        2.2.STABLE3:

        - Fixed preprocessor problems for HP-UX in lib/safe_inet_addr.c.
        - Avoid coredump in aclMatchAcl() if someone tries to use
          proxy authentication with a non-HTTP request (e.g. icp_access).
        - Moved 'ident_lookup_access' in squid.conf so it appears
          after the ACL section.
        - Fixed typo in squid.conf on "Config.Addrs.snmp_outgoing"
        - Fixed a case in clientCacheHit() where we thought it
          was a hit, but the reply status was not 200, so we
          had to perform a cache miss.  We forgot to change the
          log_type and these were being recorded as TCP_HIT's.
        - Fixed a void pointer subtraction bug in delayIdPtrHashCmp().
        - Fixed delay_pools coredump and memory leak bugs from
          NULL delay_id values.
        - Fixed a SEGV bug with delay_pools when requesting
          'objects' or 'vm_objects' from the cachemgr.
        - Added a workaround for buggy FTP servers that return
          a size of zero for non-zero-sized objects.
        - Removed umask(0) call from main().
        - Fixed a peer selection bug that caused us to never select
          a neighbor based on ICP replies if the ICP timeout occurs.
          In conjunction with this, removed the PING_TIMEOUT state.
        - Fixed a store_rebuild bug that caused us to get stuck trying
          if a cache_dir subdirectory didn't exist.
        - Fixed a buffer overrun bug in gb_to_str().

        2.2.STABLE4:

        - Fixed a dread_ctrl leak caused in store_client.c
        - Fixed a memory leak in eventRun().
        - Fixed a memory leak of ErrorState structures due to
          a bug in forward.c.
        - Fixed detection of subdomain collisions for SPLAY trees.
        - Fixed logging of hierarchy codes for SSL requests (Henrik
          Nordstrom).
        - Added some descriptions to mib.txt.
        - Fixed a bug with non-hierarchical requests (e.g. POST) 
          and cache digests.  We used to look up non-hierarchical
          requests in peer digests.  A false hit may cause Squid
          to forward a request to a sibling.  In combination with
          'Cache-control: only-if-cached, this generates 504 Gateway
          Timeout responses and the request may not be re-forwardable.
        - Fixed a filedescriptor leak for some aborted requests.  


Changes to Squid-2.1 (November 16, 1998):

        - Changed delayPoolsUpdate() to be called as an event.
        - Replaced comm_select FD scanning loops with global fd_set
          structures.  Inspired by Jeff Mogul's patch for squid 1.1.
        - Moved functions common to dns.c, redirect.c, authenticate.c,
          ipcache.c, and fqdncache.c into helper.c.
        - Changed storeClientCopy2() so that it keeps sending the remainder
          of a STORE_ABORTED request, instead of cutting off the client as
          soon as the object becomes aborted.
        - Fixed combined ipf-transparent proxy and a local http-accelerator
          operation (Quinton Dolan).
        - Rewrote base64_decode.c because of potential buffer overrun
          bugs.
        - Configurable handling of whitespace in request URI's.
          See 'uri_whitespace' in squid.conf.
        - Added ability to generate HTTP redirect messages from
          the redirector output by prepending "301:" or "302:" to the
          new url.  See FAQ 4.16 for more details.
        - Eliminated refreshWhen() which was out-of-sync with refreshCheck()
          potentially causing under-utilized cache digests
        - Maintain refreshCheck statistics on per-protocol basis so we
          can tell why ICP or Digests return too many misses, etc.
        - Fixed delay_pools.c class2/class3 typo (Simon Woods).
        - Changed squid.conf's default access controls to deny all
          HTTP requests.  Admins must write ACL rules to specifically
          allow their local clients.
        - Patched French error messages (Mathias HERBERTS).
        - NextStep porting fixes by Mike Laster:
                - use xstrdup() in cf_gen.c
                - check for putenv() in configure
                - #define S_ISDIR macro
        - Added --disable-poll configure option (Henrik Nordstrom).
        - Fixed internal URL hostname case bugs (Henrik Nordstrom).
        - Patched ftp.c so we never cache autenticated FTP requests
          (Henrik Nordstrom).
        - Fixed FTP authentication. We tried to unescape authentication
          given by basic authentication which is not URL escaped
          (Henrik Nordstrom).
        - Fixed HTTP version for common logfile format (Henrik Nordstrom).
        - Added 'redirect_rewrites_host_header' option to disable rewriting
          of Host header for redirector responses (Henrik Nordstrom).
        - Allow semi-customized error message signatures (Henrik Nordstrom).
        - Fixed bug with errors for unsupported requests (Henrik Nordstrom).
        - Fixed handling of blank lines in ACL input files (Henrik
          Nordstrom).
        - Changed proxy_auth ACL type to consist of a list of valid
          users. REQUIRED == any (same as ident ACL). ACL type user
          changed to ident since this is what it really is.
          (Henrik Nordstrom).
        - Fixed long URL bugs; make sure 'log_uri' never exceeds
          MAX_URL bytes.
        - Allow comments in external ACL files (Gerhard Wiesinger).
        - Added 'range_offset_limit' configuration option.  Requests
          with ranges that start after this value will be passed
          on unmodified, and Squid will not cache the response
          (Henrik Nordstrom).
        - Added Client HTTP Hit byte counters to 'counters' output
          (Douglas Swarin).
        - Got Squid to compile with --enable-async-io on FreeBSD.
        - Fixed infinite loop bug for cachemgr 'config' option.
        - Fixed cachability bugs for replies with Pragma: no-cache.
        - Made content-type multipart/x-mixed-replace uncachable.
        - Y2K fix for parsing dates in "Wed Jun  9 01:29:59 1993 GMT"
          format (Richard Kettlewell).
        - Fixed passing -s option to dnsserver processes (Alvaro Jose
          Fernandez Lago).
        - Changed proxy_auth to work on internal objects and when in
          accelerator mode. (Henrik Nordstrom)
        - Added login=user:password option to cache_peer directive to
          be used from a dial-up cache where the parent requires proxy
          authentication. (Henrik Nordstrom)
        - If you want to "auto-login", then use a URL on the form
          http://username:password@server/.... Squid now picks this up
          when going direct, and turns it into basic WWW
          authentication.  It is also possible to do automatic login to
          certain servers by using a redirector to add the needed
          authentication information.  (Henrik Nordstrom)
        - Changed refreshCheck() so that objects with negative age
          are always stale.
        - Fixed "plain" FTP listings (Henrik Nordstrom).
        - Fixed showing banner/logon message for top-level FTP
          directories (Henrik Nordstrom).
        * Changes below have been made to SQUID_2_1_PATCH1
        - Fixed pinger packet size assertion.
        - Fixed WAIS forwarding.
        - Fixed dnsserver coredump bug caused by using both -D and
          -s options.
        * Changes below have been made to SQUID_2_1_PATCH2
        - Fixed EBIT macro bugs when the bitmask is a 64-bit long.
        - Fixed proxy auth NULL password bug.
        - Fixed queueing of multiple peerRefreshDNS events.
        - Added a stack of StoreEntry objects to be released after
          store rebuild completes.
        - Fixed NULL pointer bugs with too-large requests (found by
          Martin Lathoud).
        - Fixed reading replies from buggy ident servers.  Replies
          might not have terminating CR or LF (Henrik Nordstrom).
        - Changed internal StoreEntry key so that the request method
          is encoded as a single octet.  Encoding an enumerated type
          has size and byte-order incompatibilities, especially for
          cache digests.
        - Fixed storeEntryLocked so that SPECIAL, but PRIVATE entries
          are not always locked.  This fixes having multiple
          store_digest's stuck in memory.
        - Fixed clientProcessOnlyIfCachedMiss so it unlocks and
          unregisters from "cache hit" entries.
        * Changes below have been made to SQUID_2_1_PATCH3
        - Fixed memory leak in clientHandleIMSReply for
          storeClientCopy failures.

Changes to Squid-2.0 (October 2, 1998):

        - Added NAT/Transparent hijacking code from Quinton Dolan.
        - Added actual filesystem usage to cachemgr 'storedir' page.
          Only works for operating systems which support statvfs().
        - Fixed HTCP compile-time bugs.
        - Fixed quick_abort bugs.  Configured values are stored as
          Kbytes, not bytes.
        - Removed fwdAbortFetch().  It breaks quick_abort and seems
          mostly useless.
        - Changed storeDirSelectSwapDir() to skip swap directories
          when their utilization is over the high water mark ratio.
        - Fixed off-by-one bug for dead neighbor detection (Joe Ramey).
        - fixed bugs in Content-Range header generation
        - changed the way Range requests are handled:
                - do not "advertise" our ability to process ranges at
                  all
                - on hits, handle simple ranges and forward complex
                  ones
                - on misses, fetch the whole document for simple ranges
                  and forward range request for complex ranges
          The change is supposed to decrease the number of cases when
          clients such as Adobe acrobat reader get confused when we
          send a "200" response instead of "206" (because we cannot
          handle complex ranges, even for hits) Note: Support for
          complex ranges requires storage of partial objects.
        - Removed SNMP mib-2.system group from squid.
        - Removed SNMP ability to iterate through ipcache and friends.
        - Added SNMP ipcache/fqdncache basic statistics.
        - Converted SQUID-MIB to SMIv2 (RFC 1902).
        - Moved SQUID-MIB to enterprises section of the tree in preparation
          of the split into PROXY-MIB & SQUID-MIB.
        - Corrected minor errors in SQUID-MIB.
        - Moved uptime into cacheSystem from cacheConfig.
        - Corrected a number of get-next-request bugs, snmpwalk should now
          return all objects and not skip some.
        - Fixed netdbClosestParent() so it won't return sibling
          peers.
        - Fixed a bug with secondary clients on entries with
          ENTRY_BAD_LENGTH set.  We should release the
          bad entry to prevent secondary clients jumping on.
        - Changed MIB to prevent parse warnings at startup.
        * Changes below have been made to SQUID_2_0_PATCH1
        - Fixed a forwarding loop bug.  Even though we were detecting
          a loop, it was not being broken.
        - Try to prevent sibling forwarding loops by NOT forwarding a
          request to a sibling if we have a stale copy of the object.
          Validation requests should only be sent to parents (or
          direct).
        - Fixed ncsa_auth hash bugs when re-reading password file.
        - Changed clientHierarchical() so that by default SSL/CONNECT
          requests do NOT go to neighbor caches.
        - Changed clientHandleIMSReply() to not call storeAbort()
          because there can be more than one client hanging on the
          StoreEntry.  This hopefully fixes "store_status !=
          STORE_ABORTED" assertions.
        - Added temporary fix to httpMakePublic() to prevent assertions
          (!EBIT_TEST(e->flags, RELEASE_REQUEST)) in storeSetPublicKey().
        * Changes below have been made to SQUID_2_0_PATCH2
        - PATCH1 introduced a seriously stupid bug which prevented ICP
          queries for all requests.  Fixed by checking
          request->hierarchical in peerSelectFoo().

Changes to squid-1.2.beta25 (September 21, 1998):

        - Fixed async IO bugs from adding filedescriptor arg to AIOCB
          callbacks (Henrik Nordstrom).
        - Fixed store_swapout.c assertion.  We were freeing object data
          past the swapout_done offset.  This probably happens (only?)
          when an object changes from cachable to uncachable while
          it is being swapped out.
        - Added MEM_CLIENT_SOCK_BUF type so we can change the size
          of the buffers used for writing data to the client sockets.
        - Added configure check for libbind.a.  If found, it will be
          used instead of libresolv.a.
        - Changed fwdStart() to always allow internally generated
          requests, such as for peer digests.  These requests are
          known to fwdStart() because the address arg is set to
          'no_addr'.
        - Completed initial HTCP implementation.  It works, but is not
          tested much.
        - Added counters for I/O syscalls.
        - Fixed httpMaybeRemovePublic.  With broken ICP neighbors
          (netapp) Squid doesn't use private keys.  This caused us
          to remove almost every object from the cache.
        - Added 'asndb' cachemgr stats to show AS Number tree.
        - Fixed AS Number byte-order bug for netmasks.
        - Fixed comm_incoming calling rate for high loads (Stewart
          Forster).
        - Give always_direct higher precedence than never_direct
          (Henrik Nordstrom).
        - Changed PORT ACL type to accept ranges.  Now you can easily
           deny, for example, all priveleged ports except 80, 70, 21,
           etc.
        - ARP ACL fixes for Linux (David Luyer).
        - Replaced various "EBIT" flags bitfileds with structures of
          "int:1" members.
        - Changed storeKeyPrivate and storeKeyPublic to be a bit more
          efficient by removing snprintf().  This causes an
          incompatibility with old cache keys, however.  To transition,
          we will look up both the new and old style keys for about the
          next 30 days.  After that, if you haven't run this (or a
          future) version, your cache contents will be lost.
        - Made the client-side write buffer size configurable with
          a #define in defines.h.  By default it is still 4096 bytes.
        - Removed redirectUnregister().  It should be unnecessary
          because of cbdata locks.
        - Fixed multiple HEAD request brokennesses (Henrik Nordstrom).
        - Changed non-blocking connect(2) code to call getsockopt()
          instead of connect() again.  This is the approach recommended
          by Stevens, and fixes bugs on BSD-ish systems when subsequent
          connect() calls loop with EAGAIN status.
        - Added MD5 cache keys to memory pool accounting.
        - Added code to track number of open DISK descriptors and stop
          swapping out objects if the number of disk descriptors becomes
          too large.  For now the limit must be manually configured with
          the 'max_open_disk_fds'.  By default, there is no limit.
        - Stopped encoding a request method in the high byte of the ICP
          reqnum field.  Instead queried cache keys are copied to a
          static array, indexed by the reqnum, modulo the array size.
          Now we just use the request number to lookup a cache key,
          instead of rebuilding it from the ICP reply URL and method,
          unless we have netapp neighbors--they don't do reqnum
          properly.
        - Fixed reconfigure memory access bugs in redirect.c.
        - Ignore unreasonably large ICP RTT values which cause overflow
          bugs in calculating the average RTT (thanks Niall!)

Changes to squid-1.2.beta24 (August 21, 1998):

        - Added Bulgarian error pages by Evgeny Gechev.
        - Changed StoreEntry->lock_count to a u_short.
        - Replaced urlcmp with strcmp
        - Fixed pragma no-cache ejecting ENTRY_SPECIAL objects
          (Henrik Nordstrom).
        - Eliminated unneeded BASE HREF on "root" directories (Henrik
          Nordstrom).
        - Fixed peerDigestFetchFinish() assertion caused by forwarding
          failures (e.g. miss_access rules).
        - Changed signal handlers with ASYNC_IO and Linux so that
          -k command line options work (Miquel van Smoorenburg).
        - Rewrote shutdown code to use events instead of setting 
          FD timeouts.
        - Fixed cachemgr 'objects' (statObjects()) by adding a check
          for READ_AHEAD_GAP, and calling storeCheckSwapout() in
          storeBufferFlush().  Otherwise, the read-past pages would
          never be freed.
        - Fixed DNSSERVER shutdown bugs.  The re-opened dnsserver processes
          were being closed by the dnsServerShutdown event.
        - Modified storeHashInsert() to insert PRIVATE objects at
          the tail of the LRU list, and PUBLIC objects at the head.
          Thus, PRIVATE objects get kicked out quicker.
        - Added David Luyer's DELAY_POOLS code.
        - Fixed a bug due to HEAD replies which lack the end-of-headers
          line.
        - Made proxy-auth realm string configurable (Bob Franklin)
        - Changed default mime time to a viewable one (Henrik Nordstrom).
        - configure fixes for Sony's NEWS-OS 6.x (Makoto MATSUSHITA).
        - Fixed 'you are running out of filedescriptors' bug which
          could cause the HTTP incoming connection handler to not
          be reset.
        - Changed syslog logging.  Now squid debug levels 0 and 1 go
          to syslog.  Level 0 gets LOG_WARNING and level 1 gets LOG_NOTICE
          (this needs more work!)
        - Fixed memory access errors in statAvgTick().
        - Fixed duplicate requestUnlink() bug in forward.c
        - Fixed possible memory access bugs from not setting e->mem_obj
          = NULL in destroy_MemObject().
        - Deleted TCP_IMS_MISS tag.  Always use TCP_IMS_HIT instead.
        - Modified headersEnd and httpMsgIsolateHeaders to account
          for funky line terminations such as CRCRNL.
          (``but Netscape and IE _tolerate_ this'')
        - Fixed carp functions (Eric Stern).
        - Replaced internal proxy_auth code with extern authentication
          module (Arjan de Vet).
        - moved hash.c to libmiscutil.a.
        - Fixed handling of ICP queries with whitespace in URLs.
          Now we return ICP error and escape the URL before logging.
        - Added configure check for socklen_t (David Luyer).
        - Removed USE_SPLAY #defines; it is now standard.
        - Added FD arg to async IO callbacks (AIOCB) so we can eliminate
          temporary disk_ctrl_t structures.
        - Changed ENOSPC disk write errors to reduce specific cache_dir
          sizes, and not just the size of the cache as a whole.
        - Added httpMaybeRemovePublic() to purge public objects for
          certain responses even though they are uncachable.  This is
          needed, for example, when an initially cachable object
          later becomes uncachable.
        - Added refresh_pattern options to ignore client reloads
          (Henrik Nordstrom)
        - Relocated disk.c code which combines blocks for writing
          (Stewart Forster).

Changes to squid-1.2.beta23 (June 22, 1998):

        - Added Turkish error pages by Tural KAPTAN.
        - Added basic support for Range requests. For most cachable
          requests, Squid replies with an "Accept-Ranges" header. Upon
          receiving a potentially cachable Range request for a not
          cached object, Squid requests the whole object from origin
          server and then replies with specified range(s) to the
          client. Multi-range requests are supported. Adjacent
          overlapping ranges are merged. If-Range requests are
          supported.  Limitations:  Multi-range requests with out of
          order ranges are not supported.
        - Made md5.c use standard memcpy and memset if they are
          avaliable.
        - Memory pools will now shrink if Squid is run-time
          reconfigured with smaller value of memory_pools_limit tag.
        - Added counter for number of clients (Tomi Hakala).
        - Changed neighbor UP/DOWN algorithm to require 10 failed TCP
          connections for UP->DOWN transition.
        - Added 'unique_hostname' configuration option when its
          necessary to have multiple machines with the same visible
          hostname.
        - Fixed pumpReadFromClient() to not read too many bytes on
          persistent connections.
        - We can now cache HTTP replies with Set-Cookie.  These evil
          headers are now filtered out for cache hits on the client
          side.
        - Fixed SNMP bugs caused by using snmpwalk.
        - Fixed snmp system Group; all objects are now returned.
        - Fixed snmp system Group sysDescr and sysContact.
        - Fixed snmp system Group sysObjectID it now returns a OBJECT
          IDENTIFIER.
        - Allocate FwdState from mem pools.
        - Minor HTCP progress.
        - Moved 'miss_access' ACL check from client_side.c to forward.c
        - Fixed logging of usernames for requests which require
          proxy-authentication.
        - Fixed HTTP request parser to accept lowercase HTTP identifier
          (Oskar Pearson).
        - Fixed FTP listings to always include links to the parent
          directory (Henrik Nordstrom).
        - Fixed FTP to show an "empty" listing instead of showing
          a "document contains no data" error (Henrik Nordstrom).
        - Fixed refreshCheck() bug.  Often it was checking the
          refresh patterns against the string "[null_mem_obj]"
          because we moved URLs to MemObject.
        - Added CARP support by Eric Stern.
        - Fixed select-spin bug when an ICP reply actually gets queued
          and we failed to execute the write callback.
        - Fixed a storeCheckSwapOut bug.  We were freeing up to
          the queued offset instead of the done offset.  This
          resulted in a small chunk of object data not being in
          memory and not yet written to disk.  A client could
          recieve a partial object because file_read() unexpectedly
          returns EOF.
        - Fixed proxy-authentication hangs (Henrik Nordstrom).
        - Fixed request_t->flags bug causing authenticated, proxied
          responses to be cached (Arjan de Vet).
        - Fixed MIME types for .tgz extension (Henrik Nordstrom).
        - Added view and download options to FTP listings (Henrik
          Nordstrom).
        - Modified configure to allow using pre-installed libdlmalloc.a
          (Masashi Fujita).
        - Fixed cachemgr 'objects' implementation.
        - Changed refreshCheck() algorithm.   For cached objects, we
          now check, in the following order:
                * request max-age
                * response Expires (if present)
                * refresh_pattern max-age
                * response Last-Modified compared to refresh_pattern
                  LM-factor (only if Last-Modified is present)
                * refresh_pattern min-age
        - Changed Copyrights.

Changes to squid-1.2.beta22 (June 1, 1998):

        - do not cut off "; parameter" from "digitized" Content-Type 
          http fields
        - Added X-Request-URI for persistent connection debugging 
          (Henrik Nordstrom)
        - Added Polish error pages from Maciej Kozinski.
        - Fixed hash_first/hash_next bugs with **Current pointer.
          Replaced with *next pointer.
        - Fixed PUT/POST bugs in client (Henrik Nordstrom).
        - Deny forwarding loops in httpd accel mode (Henrik Nordstrom).
        - Fixed eventRun "spin" bug when event delta time == 0.
        - Fixed setting Last Modified time on cached entries when
          receiving a 304 reply.
        - Added while loop in httpAccept().
        - Added while loop in icpHandleUdp().
        - Fixed some small memory leaks.
        - Fixed single-bit-int flag checks (Henrik Nordstrom).
        - Replaced "complex" (offset accounting) calls to snprintf with MemBuf
        - Do not send only-if-cached cc directive with requests 
          for peer's digests.
        - Added "automatic tuning" for incoming request rate, i.e.
          how often to check HTTP and ICP sockets.  See comm.c
          comments for details.

Changes to squid-1.2.beta21 (May 22, 1998):

        - Added Italian error pages by Alessio Bragadini.
        - Added Estonian error pages by Toomas Soome.
        - Added Russian (koi-r) error pages by Andrew L. Davydov.
        - Added Czech error pages by Jakub Nantl.
        - Fixed asnAclInitialize calling to prevent coredump.
        - Fixed FTP directory parsing again.
        - Made FTP directory listing "Generated" tagline like
          the one for error pages.
        - Fixed an assertion coredump in statHistCopy from 
          reconfiguring with different #peers in squid.conf
        - Ignore leading whitespace on requests (and replies).  RFC
          2068 section 4.1, robustness (Henrik Nordstrom)
        - Fixed keep_alive bug.  We did not always honour reply
          headers, but rather assumed connections could be persistent.
        - Fixed reading whois output for AS numbers, especially when
          they are longer than 4 KB.
        - Removed 'cache_stoplist_pattern' configuration option.  This
          feature is now handled by 'no_cache'.
        - If a URN resolves to only one URL, just return it immediately
          instead of giving the user a "choice" (Andy Powell).
        - Fixed year-2000 bug in lib/iso3307.c (Henrik Nordstrom).
        - Changed squid-internal object names.
        - Added netdb exchange protocol.
        - Fixed wordlistDestroy() uninitialized pointer bug in
          ftpParseControlReply.
        - Fixed redirector subprocess to show real program name.
        - Changed URN menu output to be sorted.
        - Added fast select(2) timeouts when using ASYNC_IO.
        - Added ARP ACL support for Linux (David Luyer).
        - Added binary http headers to requests
        - request_t objects are now created and destroyed in a consistent way
        - Fixed cache control printf bug
        - Added a lot of new http header ids
        - Improved Connection: header handling; now both Connection and
          Proxy-Connection headers are checked for connection directives
        - Connection request header is now handled correctly regardless
          of its position and the number of entries
        - Only replies with valid Content-Length can be sent with keep-alive
          connection directive (Henrik Nordstrom)
        - Better handling of persistent connection "clues" in HTTP headers;
          the decision now depends on HTTP version (and User-Agent exceptions)
        - Removed handling of "length=" directive in IMS headers;
          the directive is not in the HTTP/1.1 standard;
          standing by for objections
        - allowed/denied headers are now checked using bit masks instead of
          strcmp loops
        - removed Uri: from allowed headers; Uri is deprecated in RFC 2068
        - removed processing of Request-Range header (not in specs?)
        - Fixed byte-order bugs in cacheDigestHashKey.
        - Changed hash_remove_link() to return void.
        - Changed ipcache_gethostbyname() to return NULL if
          i->addrs.count == 0.
        - Added millisecond-timing to select/poll loops and event
          queue.
        - Changed 'peerPingTimeout' value to be twice the average
          of all the peer ICP RTT's.
        - Added 'half_closed_clients' option to force closing of
          client connections which might only be half-closed.
        - Fixed matchDomainName coredump bug.
        - Don't cache HTTP replies with Vary: headers until we
          get content negotiation working.
        - Fixed SSL proxying to forward full HTTP request headers.
        - Changed storeGetMemSpace().  Only purge down to the HIGH
          water mark; move locked entries to the head of the inmem
          list.
        - Changed clientReadRequest() to locally handle any
          "squid-internal-static" URL for any host.
        - Disable persistent connections for client connections
          from broken Netscape User-Agent, version 3.* (Stewart Forster)

Changes to squid-1.2.beta20 (April 24, 1998):

        - Improved support for only-if-cached cache control directive.
        - Enabled 304 replies for ENTRY_SPECIAL objects (e.g., icons).
        - Fixed 'quick_abort' percent calculation bug.
        - Fixed quick_abort FPE bug.
        - Changed more errno-checking functions to use ignoreErrno().
        - Added ERESTART to ignoreErrno() because of report from
          a Solaris system.
        - Fixed '#elsif' typo.
        - Fixed MemPool assertion by moving memInit() to before
          configuration parsing functions.
        - Fixed default 'announce_period' value (was 1 day, should
          be 0) (Joe Ramey).
        - Added configure warning for low filedescriptors and pointer
          to FAQ.
        - Fixed httpBodySet() bug causing URN related coredumps.
        - Changed ipcacheCycleAddr() to always cycle through all all
          available addresses, and not just advance when one of
          them goes BAD.
        - Fixed squid-internal bug for mixed-case hostnames (Henrik
          Nordstrom).
        - Fixed ICP counting probelm.  icpUdpSend() arg should be
          LOG_ICP_QUERY instead of LOG_TAG_NONE.
        - Added some additional fault toleranse on FTP data channels
          (Henrik Nordstrom).
        - Corrected error reporting on FTP "hacks" (Henrik Nordstrom).
        - Added lock/unlock for StoreEntry during storeAbort().
        - Added filemap bit usage stats to cachemgr 'storedir' and
          'info'.
        - Replaced 'cache_stoplist' with 'no_cache' Access list.
        - Fixed (hopefully) remaining swapfile-open-at-exit bugs.
        - Fixed default hierarchy_stoplist to be ``default if none.''
        - Fixed 'fake a recent reply' hack for detecting DEAD
          and ALIVE neighbors (Joe Ramey).
        - Fixed FTP directory parsing bugs (Joe Ramey).
        - Fixed ftpTraverseDirectory coredump for NULL ftpState->filepath
          (Joe Ramey).
        - Fixed daylight savings time bug (again).
        - A lot of Cache Digests additions, fixes, and tuning. 
          Cache Digests are still "very experimental".
        - Fixed snprintf() bug.  When len == 1, snprintf() would treat
          the buffer as unknown size, emulating sprintf() behaviour.
        - Made Error page language configurable with configure script
          (Henrik Nordstrom).
        - Fixed squid-internal URLs when http_port == 80.
        - Remember the client address on redirected requests (Henrik
          Nordstrom).
        - Don't rebuild the request if the redirector returned the same
          URL (Henrik Nordstrom).
        - Rewrite Host: header on redirected requests (Henrik
          Nordstrom).
        - Include port (if non-standard) in generated Host: headers
          (Henrik Nordstrom).
        - Fixed rfc1123 timezone hacks for Windows NT
          (Henrik Nordstrom).
        - Added Russian Error pages by Ilia Zadorozhko.
        - Added totals for ICP and HTTP hits to cachemgr client_list
          output.
        - Changed error message to 'Generated TIME by HOST (SQUID/VER)'
          because any string with an '@' must be an email address.
        - Fixed POST for content-length == 0.
        - Fixed "huge 304 reply" loop bug.
        - Fixed --enable-splaytree compile bugs.
        - Removed ASN lookup code in peer_select.c.
        - Added warnings if ACL code detects subdomains in SPLAY
          trees.
        - Rewrote some bits of httpRequestFree() to eliminate
          possible bugs that could cause an "e->lock_count" asseertion.
        - Added value/bounds checking to _db_init() when setting
          the debugLevels[] array.

Changes to squid-1.2.beta19 (Apr 8, 1998):

        - Squid-1.2.beta19 compiles and runs on Windows/NT with
          Cygnus Gnu-WIN32 b19 (Henrik Nordstrom).
        - Added French Error pages by Frank DENIS.
        - Added Dutch Error pages by Mark Visser
        - Added German Error pages by Bernd P. Ziller, Jens Frank,
          and Anke S.
        - Added support for only-if-cached cache-control directive.
        - Added RELAXED_HTTP_PARSER #define to allow requests which are
          missing the HTTP identifier on the request line (e.g. buggy
          SpyGame queries).  RELAXED_HTTP_PARSER is undefined by default.
        - Fixed disk.c FD leak for delayed closes in
          diskHandleWriteComplete().
        - Fixed cache announcement feature.
        - Fixed httpReadReply() to retry failed HTTP requests on
          persistent connections when read() returns -1, not only
          when it returns 0.
        - Fixed cbdata memory counting leak.  cbdataUnlock() always
          called free(), never memFree().
        - Fixed storeDirWriteCleanLogs() malloc bug on Alphas.
        - Fixed `++loopdetect < 10' assertion due to
          clientHandleIMSReply bug for invalid/partial HTTP
          replies.
        - Added preliminary code for HTCP.
        - Renamed 'aux' dir to 'cfgaux' for legacy DOS machines.
        - Added "snmp_community" as an ACL type.
        - Cleaned up proxy-auth acl implementation and removed
          memory leaks.
        - Added generic 'hashFreeItems()' function for efficiently
          freeing hash table pointers.
        - Added whoisTimeout() for ASN code.
        - Removed BINARY TREE code.
        - Fixed forgetting to reset Config.Swap.maxSize in
          configDoConfigure.
        - Fixed httpReplyUpdateOnNotModified() arguments-in-wrong-order
          bug which caused not modified replies to not get updated.
        - Fixed client_side.c bugs which could cause data to be written
          to the client in the wrong order for persistent connections.
          clientPurgeRequest() and clientHandleIMSComplete() must not
          call comm_write().  Instead they must create and write to
          StoreEntry's.
        - Fixed ICP query service time counting bug(s).
        - replaced 'char *mime_headers_end()' with 'size_t headersEnd()'
          to fix buffer overruns.  This also requires adding 'buf_sz'
          args to some functions like clientBuildReplyHeader().
          But we can eliminate the need to NULL-terminate the
          buffer beforehand.
        - Changed commConnectCallback() to reset the FD timeout to
          zero before notifying about the connection.  This requires
          commSetTimeout() calls in numerous places to reinstall
          timeouts.
        - Changed comm_poll_incoming() to be called less frequently
          (every 15 I/O's instead of every 7 FD's) (Michael O'Reilly).
        - Removed HAVE_SYSLOG case for debug() macro.  Almost all
          systems do have syslog(), but more importatnly the
          _db_level value is needed for debugging to stderr.
        - Rewrote squid/dnsserver interface to use smaller, single-line
          messages.
        - Rewrote 'dns' cachemgr output to use a table format.
        - Rewrote a lot of dnsserver.c.
        - Added eventAddIsh() for semi-random event scheduling.
        - Fixed an ftpTimeout bug for sessions which use PORT
          commands.
        - Fixed ftp.c to recognized invalid PASV replies (e.g.
          port == 0).
        - Removed hash_insert().  All hasing uses hash_join() now.
        - Renamed hash_unlink() to hash_remove_link().
        - Added hashPrime() to find closes prime hash table size
          to a given value.
        - Fixed Keep-Alive ratio counting bug which prevented
          persistent connections from being used between cache
          peers.
        - Changed icmp.c to NOT queue messages sent from squid to
          the pinger program.
        - Changed icp_v2.c to NOT queue ICP messages by default.
          But they will be queued and resent once if the first
          send fails.  Counters.icp.queued_replies counts the
          number of messaages queued.
        - Cleaned up ICP logging.
        - Added identTimeout().
        - Fixed ipcache reply counting bug.  Overcounted dnsserver
          replies for partial replies.
        - Added urlInternal() for building internal Squid URLs.
        - Changed peerAllowedToUse() to check both 'cache_peer_domain'
          AND 'cache_peer_acl' configurations.  This should be changed
          in the fugure to use ONLY cache_peer_acl.
        - Changed DEAD/REVIVED neighbor detection to avoid reporting
          so many false deaths.  (Joe Ramey).
        - Added some preliminary code to support "cache digests."
        - Fixed pumpClose() coredumps (?).
        - Updated cachemgr 'info' output to show median service
          times for various categories.
        - Fixed ABW bug in storeDirWriteCleanLogs().  sizeof(off_t)
          != sizeof(int) for Alphas.
        - Fixed potential alignment problem in storeDirWriteCleanLogs().
        - Fixed store_rebuild.c to NOT replace current, but
          not-swapped-out StoreEntry's with on-disk entries.
        - Changed storeCleanup() to call storeRelease on invalid
          entries which don't have a swapfile (i.e. no unlink()
          penalty).
        - Fixed storeSwapInStart() to fail for unvalidated
          entries.
        - SNMP changes:
          .  renovated mib and added descriptions and comments
          .  added hit and byte counters to client_db , for
             cacheClientTable
          .  cacheClientTable, netdbTable, cachePeerTable,
             cacheConnTable now indexed by ip address. hash_lookup was
             enhanced to allow for subsequent hash_next's similar to
             hash_first, to speed up getnext's in tables which refer to
             hash-table structures.
          .  added generic (well, sorf of) table indexing functionality
          .  added makefile dependencies for snmplib and cache_snmp.h
          .  WaisHost, WaisPort, Timeouts removed
          .  FdTable split into FdTable and ConnTable. FdTable simplified
          .  PeerTable and PeerStat merged and put into new cacheMesh
             group
          .  cacheClientTable added for client statistics and accounting 
             (cacheMesh 2)
          .  cacheSec and cacheAccounting groups removed 
          .  fixed acl bug when communities not defined
          .  snmp_acl now survives bad configuration

Changes to squid-1.2.beta18 (Mar 23, 1998):

        - Added v1.1 'test_reachability' option.
        - Fixed hash4() len == 0 bug.
        - Fixed Config.Swap.maxSize reconfigure bug.
        - Fixed ICP query bug determining request method.
        - Moved ICP's storeGet() cache lookup into neighborsUdpAck()
          so that we know neighbors are alive even when they send
          us replies for unknown entries.
        - Changed configure script to add '-std1' for Digital Unix cc.
        - Fixed SNMP sizeof(int) / sizeof(long) bugs for 64-bit
          systems.
        - Added support for 'Cache-Control: Only-If-Cached' request header.
        - Fixed CheckQuickAbort() bugs for multiple clients on one
          StoreEntry.  Also changed storePendingNClients() to return
          mem->nclients instead of counting the number of store_client
          entries with pending callback functions.

Changes to squid-1.2.beta17 (Mar 17, 1998):

        - SNMP MIB version check changed to non-rcs.
        - Added memory pools for variable size objects (strings).
          There are three pools; for small, medium, and large objects.  
        - Extended String object to use memory pools.  Most fixed size char
          array fields will be replaced using string pools. Same for most
          malloc()-ed buffers.
        - Changed icon handling to use the hostname and port of the squid
          server, instead of the special hostname "internal.squid"
          (Henrik Nordstrom).
        - All icons are now configured in mime.conf. No hardcoded icons,
          including gohper icons (Henrik Nordstrom).
        - Fixed ICP bug when we send queries, but expect zero
          replies.
        - Fixed alignment/casting bugs for ICP messages.
        - A generic client-to-server "pump" was added to handle HTTP
          PUT as well as POST methods on the client-cache side. Based on
          "pump" PUT requests can be made to either HTTP or FTP url's.
          Code is still beta and interoperability with browsers etc has
          not been tested.
        - Put #ifdefs around 'source_ping' code.
        - Added missing typedef for _arp_ip_data (Wesha).
        - Added regular-expression-based ACLs for client and server
          domain names (Henrik Nordstrom).
        - Fixed ident-related coredumps from incorrect callback data.
        - Fixed parse_rfc1123() "space" bug.
        - Fixed xrealloc() XMALLOC_DEBUG bug (not calling check_free())..
        - Fixed some src/asn.c end-of-reply bugs and memory leaks.
        - Fixed some peer->options flag-setting bugs.
        - Fixed single-parent feature to work again
        - Removed 'single_parent_bypass' configuration option; instead
          just use 'no-query'.
        - Surrounded 'source_ping' code with #ifdefs.
        - Changed 'deny_info URL' to use a custom Error page.
        - Modified src/client.c for testing POST requests.
        - Fixed hash4() for SCO (Vlado Potisk).

Changes to squid-1.2.beta16 (Mar 4, 1998):

        - Added Spanish error messages from Javier Puche.
        - Added Portuguese error messages from Pedro Lineu Orso
        - Added a simple but very effective hack to cachemgr.cgi that tries to
          interpret lines with '\t' as table records and formats them
          accordingly. With a few exceptions (see source code), first line
          becomes a table heading ("<th>" html tag) and the rest is formated
          with "<td>" tags.
        - Added "mem_pools_limit" configuration option. Semantics of
          "mem_pools" option has also changed a bit to reflect new memory
          management policy.
        - Reorganized memory pools. Squid now supports a global pool
          limit instead of individual pool limits. Per-pool limits can be
          implemented on top of the current scheme if needed, but it is
          probably hard to guess their values.  Squid distributes pool
          memory among "frequently allocated" objects.  There is a
          configurable limit on the total amount of "idle" memory to be
          kept in reserve. All requests that exceed that amount are
          satisfied using malloc library.  Support for variable size
          objects (mostly strings) will be enabled soon.
        - memAllocate() has now only one parameter. Objects are always
          reset with 0s. (We actually never used that parameter before;
          it was always set to "clear").
        - Added Squid "signature" to all ERR_ pages. The signature is
          hardcoded and is added on-the-fly. The signature may use
          %-escapes.  Added interface to add more hard-coded responses if
          needed (see errorpage.c::error_hard_text).
        - Both default and configured directories are searched for ERR_
          pages now. Configured directory is, of course, searched first.
          This allows you to customize a subset of ERR_ pages (in a
          separate directory) without danger of getting other copies out
          of sync.
        - Security controls for the SNMP agent added. Besides
          communities (like password) and views (part of tree
          accessible), the snmp_acl config option can be used to do acl
          based access checks per community.
        - SNMP agent was heavily re-written, based on cmu-snmpV1.8. You
          can now walk through the whole mib tree. Several new variables
          added under cacheProtoAggregateStats
        - Added rudimental statistics for HTTP headers.
        - Adjusted StatLogHist to a more generic/flexible StatHist.
          Moved StatHist implementation into a separate file.
        - Added FTP support for PORT if PASV fails, also try the
          default FTP data port (Henrik Nordstrom).
        - Fixed NULL pointer bug in clientGetHeadersForIMS when a
          request is cancelled for fails on the client side.
        - Filled in some squid.conf comments (never_direct,
          always_direct).
        - Added RES_DNSRCH to dnsserver's _res.options when the 
          -D command line option is given.
        - Fixed repeated Detected DEAD/REVIVED Sibling messages when
          peer->tcp_up == 0 (Michael O'Reilly).
        - Fixed storeGetNextFile's incorrect "directory does not exist"
          errors (Michael O'Reilly).
        - Fixed aiops.c race condition (Michael O'Reilly, Stewart
          Forster).
        - Added 'dns_nameservers' config option to specify non-default
          DNS nameserver addresses (Maxim Krasnyansky).
        - Added lib/util.c code to show memory map as a tree
          (Henrik Nordstrom).
        - Added HTTP and ICP median service times to Counters and
          cachemgr average stats.
        - Changed "-d" command line option to take debugging level
          as argument.  Debugging equal-to or less-than the argument
          will be written to stderr.
        - Removed unused urlClean() function from url.c.        
        - Fixed a bug that allowed '?' parts of urls to be recorded in
          store.log.  Logged urls are now "clean".
        - Cache Manager got new Web interface (cachemgr.cgi). New .cgi
          script forwards basic authentication from browser to squid.
          Authentication info is encoded within all dynamically generated
          pages so you do not have to type your password often.
          Authentication records expire after 3 hours (default) since
          last use. Cachemgr.cgi now recognizes "action protection" types
          described below.
        - Added better recognition of available protection for actions
          in Cache Manager. Actions are classified as "public" (no
          password needed), "protected" (must specify a valid password),
          "disabled" (those with a "disable" password in squid.conf), and
          "hidden" (actions that require a password, but do not have
          corresponding cachemgr_passwd entry). If you manage to request
          a hidden, disabled, or unknown action, squid replies with
          "Invalid URL" message. If a password is needed, and you failed
          to provide one, squid replies with "Access Denied" message and
          asks you to authenticate yourself.
        - Added "basic" authentication scheme for the Cache Manager.
          When a password protected function is accessed, Squid sends an
          HTTP_UNAUTHORIZED reply allowing the client to authorize itself
          by specifying "name" and "password" for the specified action.
          The user name is currently used for logging purposes only.  The
          password must be an appropriate "cachemgr_passwd" entry from
          squid.conf. The old interface (appending @password to the url)
          is still supported but discouraged.  Note: it is not possible
          to pass authentication information between squid and browser
          *via a web server*. The server will strip all authentication
          headers coming from the browser. A similar problem exists for
          Proxy-Authentication scheme.
        - Added ERR_CACHE_MGR_ACCESS_DENIED page to notify of
          authentication failures when accessing Cache Manager.
        - Added "-v" (Verbose) and "-H" (extra Headers) options to client.c.
        - Added simple context-based debugging to debug.c. Currently,
          the context is defined as a constant string. Context reporting
          is triggered by debug() calls.  Context debugging routines
          print minimal amount of information sufficient to describe
          current context. The interface will be enhanced in the future.
        - Replaced _http_reply with HttpReply. HttpReply is a
          stand-alone object that is responsible for parsing, swapping,
          and comm_writing of HTTP replies. Moved these functions from
          various modules into HttpReply module.
        - Added HttpStatusLine, HttpHeader, HttpBody.
        - All HTTP headers are now parsed and stored in a "compiled"
          form in the HttpHeader object.  This allows for a great
          flexibility in header processing and builds basis for support
          of yet unsupported HTTP headers.
        - Added Packer, a memory/store redirector with a printf
          interface.  Packer allows to comm_write() or swap() an object
          using a single routine.
        - Added MemBuf, a auto-growing memory buffer with printf
          capabilities.  MemBuf replaces most of old local buffers for
          compiling text messages.
        - Added MemPool that maintains a pre-allocated pool of opaque
          objects.  Used to eliminate memory thrashing when allocating
          small objects (e.g.  field-names and field-value in http
          headers).

Changes to squid-1.2.beta15 (Feb 13, 1998):

        NOTE: This version has changes which may cause all or part
              of your cache to be lost.  However, you can problably
              save most of it by doing a slow restart.  Specifically:

        1. Kill the running squid-1.2.beta14 process; wait for it to
           fully exit.
        2. Remove all 'swap.state*' files, either in each cache_dir, or
           as defined in your squid.conf
        3. Start squid-1.2.beta15.   The store will be rebuilt from the
           existing swap files, reading the directories and opening
           the files.

        - Fixed some problems related to disk (and pipe) write error
          handling.  file_close() doesn't always close the file
          immediately; i.e. when there are pending buffers to write.
          StoreEntry->lock_count could become zero while a write is
          pending, then bad things happen during the callback.
        - The file_write() callback data must now be in the callback
          database (cbdata).  We now use the swapout_ctrl_t structure
          for the callback data; it stays around for as long as we are
          swapping out.
        - Changed the way write errors are handled by diskHandleWrite.
          If there is no callback function, now we exit with a fatal
          message under the assumption that the file in question is a
          log file or IPC pipe.  Otherwise, we flush all the pending
          write buffers (so we don't see multiple repeated write errors
          from the same descriptor) and let the upper layer decide how
          to handle the failure.
        - Fixed storeDirWriteCleanLogs.  A write failure was leaving
          some empty swap.state files, even though it tells us that its
          "not replacing the file."  Don't flush/rename logs which we
          have prematurely closed due to write failures, indiciated by
          fd[dirn] == -1.  Close these files LAST, not before
          renaming.
        - Fixed storeDirClean to clean directories in a more sensible
          order, instead of the new "MONOTONIC" order for swap files.
        - Merged fdstat.c functions into fd.c.
        - Cleaned up some debugging sections.  Some unrelated source
          files were using the same section.
        - Removed curly brackets from all cachemgr output.
        - Removed unused filemap->last_file_number_allocated member.
        - Removed unused fde->lifetime_data member.
        - Fixed incorrectly applying htonl() on icp_common_t->shostid.
        - Call setsid() before exec() in ipc.c so that child processes
          don't receive SIGINT (etc) when running squid on a tty.
        - Changed StoreEntry->object_len to ->swap_file_sz so we
          can verify the disk file size at restart.  Moved object_len
          to MemObject->object_sz.  Note object_sz is initialized
          to -1.  If object_sz < 0, then we need to open the swap
          file and read the swap metadata.
        - Changed store_client->mem to ->entry because we need
          e->swap_file_sz to set mem->object_sz at swapin.
        - Renamed storeSwapData structure to storeSwapLogData.
        - Fixed storeGetNextFile to not increment d->dirn.  Added
          check for opendir() failure.
        - Fixed storeRebuildStart to properly link the directory
          list for storeRebuildfromDirectory mode.
        - Added -S command line option to double-check store
          consistency with disk files in storeCleanup().
        - Fixed a problem with transactional logging.  In many
          cases we were adding the public cache key and then
          logging a delete for the private key.  This is worthless
          because during rebuild we could not locate the previous
          public-keyed entry.  Now we assert that only public-keyed
          entries can be logged to swap.state.  storeSetPublicKey()
          and storeSetPrivateKey() have been modified to log an
          ADD or DEL when the key changes.
        - Fixed storeDirClean bug.  Needed to call
          storeDirProperFileno() so the "dirn bits" get set.
        - Fixed a storeRebuildFromDirectory bug.  fullpath[] and
          fullfilename[] were static to that function and did
          not change when the "rebuild_dir" arg did.  Moved these
          buffers to the rebuild_dir structure.
        - In storeRebuildFromSwapLog, we were calling storeRelease()
          for cache key collisions.  This only set the RELEASE_REQUEST
          bit and did not clear the swap_file_number in the filemap or
          in the StoreEntry, so the swap file could get unlinked later
          when it was really released.
        - Fixed FTP so that ';type=X' specifically sets the HTTP reply
          content-type and content-encoding (Henrik Nordstrom).
        - Removed 'icon_content_type' configuration option.  Content
          types now taken from mime.conf (Henrik Nordstrom).
        - Added additional memory malloc tracing and memory leak
          detection.  Use --enable-xmalloc-debug-trace configure
          option and -m command line option  (Henrik Nordstrom).

Changes to squid-1.2.beta14 (Feb 6, 1998):

        - Replaced snmplib free() calls with xfree().
        - Changed the 'net_db_name' hash table structure to
          make it easier to move names from one network to another
          (copied from 1.1 code).
        - Filled in some of the config dump routines (dump_acl,
          dump_acl_access).
        - Full memory debugging option (--enable-xmalloc-debug-trace)
          (Henrik Nordstrom).
        - Filled-in and clarified many squid.conf comments (Oskar
          Pearson).
        - Fixed up handling of SWAP_LOG_DEL swap.state entries.

Changes to squid-1.2.beta13 (Feb 4, 1998):

        - NOTE: With this version the "swap.state" file format has
          changed.  Running this version for the first time will
          cause your current cache contents to be lost!
        - NOTE: this version still has the bug where we don't rewind
          a swapout file and rewrite the swap meta data.  Objects
          larger than 8KB will be lost when rebuilding from the swap
          files.
        - Combined various interprocess communication setup functions
          into ipcCreate().
        - Removed some leftover ICP_HIT_OBJ things.
        - Removed cacheinfo and proto_count() and friends; these are to
          be replaced in functionality by StatCounters and 5/60 minute
          average views via cachemgr.
        - Fixed --enable-acltree configure message (Masashi Fujita).
        - Fixed no reference to @LIB_MALLOC@ in src/Makefile.in
          (Masashi Fujita).
        - Fixed building outside of source tree (Masashi Fujita).
        - FTP: Format NLST listings, and inform the user that the NLST
          (plain) format is available when we find a LIST listing that we
          don't understand (Henrik Nordstrom)
        - FTP: Use SIZE on Binary transfers, and not ASCII. The
          condition was inversed, making squid use SIZE on ASCII
          transfers (Henrik Nordstrom).
        - Enable virtual and Host: based acceleration in order to be
          able to use Squid as a transparent proxy without breaking
          either virtual servers or clients not sending Host: header
          the order of the virtual and Host: based acceleration needs
          to be swapped, giving Host: a higher precendence than virtual
          host (Henrik Nordstrom).
        - Use memmove/bcopy as detected by configure Some systems does
          not have memmove, but have the older bcopy implementation
          (Henrik Nordstrom).
        - Completely rewritten aiops.c that creates and manages a pool
          of threads so thread creation overhead is eliminated (SLF).
        - Lots of mods to store.c to detect and cancel outstanding
          ASYNC ops.  Code is not proven exhaustive and there are
          definately still cases to be found where outstanding disk ops
          aren't cancelled properly (SLF).
        - Changes to call interface to a few routines to support disk
          op `tagging', so operations can be cleanly cancelled on
          store_abort()s (SLF).
        - Implementation of swap.state files as transaction logs.
          Removed objects are now noted with a negative object size.
          This allows reliatively clean rebuilds from non-clean
          shutdowns (SLF).
        - Now that the swap.state files are transaction logs, there's
          now no need to validate by stat()ing.  All the validation
          procedure does is now just set the valid bit AFTER all the
          swap.state files have been read, because by that time, only
          valid objects can be left.  Object still need to be marked
          invalid when reading the swap.state file because there's no
          guarantee the file has been retaken or deleted (SLF).
        - An fstat() call is now added after every
          storeSwapInFileOpened() so object sizes can be checked.   Added
          code to storeRelease() the object if the sizes don't match (SLF).
        - #defining USE_ASYNC_IO now uses the async unlink() rather than
          unlinkd() (SLF).
        - #defining MONOTONIC_STORE will support the creation of disk
          objects clustered into directories.  This GREATLY improves disk
          performance (factor of 3) over old `write-over-old-object'
          method.  If using the MONOTONIC_STORE, the
          {get/put}_unusedFileno stack stuff is disabled.  This is
          actually a good thing and greatly reduces the risk of serving
          up bad objects (SLF).
        - Fixed unlink() in storeWriteCleanLogs to be real unlink()
          rather than ASYNC/unlinkd unlinks.  swap.state.new files were
          being removed just after they were created due to delayed
          unlinks (SLF).
        - Disabled various assertions and made these into debug warning
          messages to make the code more stable until the bugs can be
          tracked down (SLF).
        - Added most of Michael O'Reilly's patches which included many
          bug fixes.  Ask him for full details (SLF).
        - Moved aio_check_callbacks in comm_{poll|select}().  It was
          called after the fdset had been built which was wrong because
          the callbacks were changing the state of the read/write
          handlers prior to the poll/select() calls (SLF).
        - Fixed ARP ACL memory leaks (Dale).
        - Eliminated URL and SHA cache keys.  Cache keys will always
          be MD5's now.
        - Fixed up store swap meta data.
        - Changed swap.state logs to a binary format.
        - The swap.state logs are written transaction-style.

Changes to squid-1.2.beta12 (Jan 30, 1998):

        - Added metadata headers to cache swap files.  This is an
          incompatible change with previous versions.  Running this
          version for the first time will cause your current cache
          contents to be lost.
        - -D_REENTRANT when linking with -lpthreads (Henrik Nordstrom)
        - Show symlink destinations as a hyperlink in FTP listings
          (Henrik Nordstrom)
        - Fixed not allocating enough space for rewriting URLs with
          the Host: header (Eric Stern).
        - Year-2000 fixes (Arjan de Vet).
        - Fixed looping for cache hits on HEAD requests.
        - Fixed parseHttpRequest() coredump for 
          "GET http://foo HTTP/1.0\r\n\r\n\r\n"

Changes to squid-1.2.beta11 (Jan 6, 1998):

        - Fixed fake 'struct rusage' definition which prevented compling
          on Solaris 2.4.
        - Fixed copy-by-ref bug for request->headers in
          clientRedirectDone() (Michael O'Reilly).
        - Workaround for Solaris pthreads closing FD 0 upon fork()
          (Michael O'Reilly).
        - Fixed shutdown bug with outgoing UDP sockets; we need to
          disable their read handlers.
        - For comm_poll(), use the fast 50 msec timeout only when
          USE_ASYNC_IO is defined.
        - Fixed pointer bug when freeing AS# ACL entries.
        - Fixed forgetting to reset Config.npeers to zero in free_peer().
        - Fixed ICP bug causing excessive TIMEOUTs with sibling
          neighbors.  We must call the ICP reply callback even for
          sibling misses.
        - Fixed some dnsserver-related reconfigure bugs. Need to 
          use cbdataLock, etc in fqdncache.c.  Also don't want to
          use ipcacheQueueDrain() and fqdncacheQueueDrain().
        - Fixed persistent connection bug.  We were incorrectly
          deciding that non-200 replies without content-length
          would not have a reply body.
        - Fixed intAverage() precedence bug.
        - Fixed memmove() 'len' arg bug.
        - Changed algorithm for determining alive/dead state of peers.
          Instead of using a fixed number of unacknowledged ICP
          replies, it is now based on timeouts.  If there are no ICP
          replies received from a peer within 'dead_peer_timeout'
          seconds, then we call it dead.
        - Added calls to getCurrentTime() in
          comm_{select,poll}_incoming() when ALARM_UPDATES_TIME is not
          being used.
        - Fixed shutdown bug when the incoming and outgoing ICP socket
          is the same file descriptor.
        - Added buffered writes for storeWriteCleanLogs() (Stewart
          Forster).
        - Patches for Qnx4 (Jean-Claude MICHOT).
        - Fixed returning void functions which seems to be a GCC-ism.
        - New configure script options (Henrik Nordstrom):
                --enable-new-storekey=[sha|md5(|url)] (was --enable-hashkey)
                --enable-acltree
                --enable-icmp
                --enable-delay-hack
                --enable-useragent-log
                --enable-kill-parent  (this should be named -hack)
                --enable-snmp
                --enable-time-hack
                --enable-cachemgr-hostname[=hostname]   (new)
                --enable-arp-acl  (new)
        - Added Doug Lea malloc-2.6.4 to the distribution, so that
          people easily can try a decent malloc package if they syspect
          their malloc is broken.  --enable-dlmalloc (Henrik Nordstrom).
        - Made XMALLOC_DEBUG_COUNT working again. Requires a small stub
          function (Henrik Nordstrom).
        - Removed top-level Makefile.  People must now run 'configure'
          before 'make'.
        - Fixed checkFailureRatio() implementation.
        - Made 'squid -z' behave like the 1.1 version.


Changes to squid-1.2.beta10 (Jan 1, 1998):

        - Fixed content-length bugs for 204 replies, 304 replies,
          and HEAD requests (Henrik Nordstrom).
        - Fixed errorAppendEntry() bug in gopherReadReply().
        - Basic support for FTP URL typecodes (;type=X).
        - Support for access controls based on ethernet MAC addresses
          (Dale).
        - Initial URN support; see
          http://squid.nlanr.net/Squid/urn-support.html
        - Fixed client-side persistent connections for objects with
          bad content lengths (Henrik Nordstrom).
        - Fixed bad call to storeDirUpdateSwapSize() for objects which
          never reach SWAPOUT_DONE state.
        - Fixed up poll() #defines in squid.h (Stewart Forster).
        - Changed poll() timeout from 1000 msec to 50 msec for
          better performance under low load (Stewart Forster).
        - Changed storeWriteCleanLogs() to write objects in the LRU
          list order instead of the random hash table order.
        - Fixed FTP bug when data socket connections fail or timeout.
        - Reuse FTP data connection when possible (Henrik Nordstrom).
        - Added configure options (Henrik Nordstrom)
                --enable-store-key=sha|md5
                --enable-xmalloc-statistics
                --enable-xmalloc-debug
                --enable-xmalloc-debug-count 
                --async-io 
        - Fixed confusing with the use/meaning of ERR_CANNOT_FORWARD
          by creating ERR_FORWARDING_DENIED and changing the
          content of the ERR_CANNOT_FORWARD text.
        - Fixed pipeline request bug from using strdup() (Henrik
          Nordstrom).
        - Call clientReadRequest() directly instead of commSetSelect()
          for pipelined requests (Henrik Nordstrom).
        - Fixed 4k page leak in icpHandleIMSReply();
        - Renamed 'icp*' functions to 'client*' names in client_side.c.

Changes to squid-1.2.beta8 (Dec 2, 1997):

        - Fixed accessLogLog() to log ident from Proxy-Authorization
          request header (BoB Miorelli).
        - Fixed #includes, prototypes, etc. in SNMP source files.
        - Moved 'POLLRDNORM' and 'POLLWRNORM' macro checks from
          include/config.h.in to src/squid.h
        - Moved 'num32' typedefs from src/typedefs.h to
          include/config.h.in.
        - Moved snmplib/md5.c to lib/md5.c.
        - Added MD5 cache key support.
        - Removed xmalloc() return check in uudeocde.c
        - Added 'ifdef' support to cf_gen.c for optional code (e.g. SNMP)
        - Changed 'client' program to provide easier cache manager access,
          e.g.: 'client mgr:info'
        - Fixed 'client' to send 'Connection' instead of 'Proxy-Connection'
          for simulated keep-alive requests.
        - Removed 'fd' arg from clientProcess* functions.
        - Fixed bugs from using errorSend() on persistent/pipelined
          client connections.  A latter request should not be allowed to
          write to the client fd until the current request completes.
          Now use errorAppendEntry() for such situations.
        - Fixed content-length bugs.  We were using content-length == 0
          to also indicate a lack of content-length reply header.  But
          'content-length: 0' might appear in a reply, so now use -1 to
          indicate that no content length given.
        - Split up clientProcessRequest() into smaller chunks so it
          might be easier to follow.
        - renamed various client_side.c functions to start with 'client'
          instead of 'icp'.
        - Fixed a 'cbdata leak' from the comm.c close handlers.
        - Fixed a 'cbdata leak' from the comm.c connect routines.
        - Fixed comm_select() and comm_poll() to stop looping on the
          incoming HTTP/ICP sockets.  If there are fewer than 7 FD's
          ready for I/O, the incoming sockets might not get service, so
          comm_select() would be called for up to 7 times until the
          'incoming_counter' was incremented enough to trigger a call
          to comm_select_incoming().  Now we make sure
          comm_select_incoming() gets called if select returns less
          than 7 ready FD's.
        - Added errorpage '%B' token to generate FTP URLs with a '%2f'
          inserted at the start of the url-path.  calls ftpUrlWith2f().
          (Henrik Nordstrom).
        - Changed fqdncache.c to use LRU double-linked list instead of qsort()
          for replacement and cachemgr output.
        - Changed ipcache.c to use LRU double-linked list instead of qsort()
        - Changed hash_insert() and hash_join() to return void.
          for replacement and cachemgr output.
        - Moved StoreEntry->method member to MemObject->method.
        - Made StoreEntry->flags 16 bits.
        - Made StoreEntry->refcount 16 bits.
        - Changed URL-based public cache key to always include the request
          method.

Changes to squid-1.2.beta7 (Nov 24, 1997):

        - Fixed poll() for Linux (David Luyer).
        - SHA optimizations (David Luyer).
        - Fixed errno clashes with macro on Linux (David Luyer).
        - Fixed storeDirCloseSwapLogs(); logs might not be open.
        - Fixed storeClientCopy2() bug.  Detect when there is
          no more data to send for objects in STORE_OK state.
        - Fixed FTP truncation bug when ftpState->size == 0, e.g.
          especially directory listings.
        - Mega FTP fix from Henrik Nordstrom.  A better job of
          implementing the '%2f' hack.
        - Fixed some pipelined request bugs.  storeClientCopy() was
          being given the wrong StoreEntry, and we had a race condition
          which is now handled by storeClientCopyPending().
        - Added initial SNMP support.

Changes to squid-1.2.beta6 (Nov 13, 1997):

        - Fixed Authorized responses getting swapped out when they
          don't have Proxy-Revalidate reply header.
        - Fixed Proxy Authentication support.  We never sent back
          a 407 reply, and were incorrectly incrementing the passwd
          before comparing it.
        - Fixed stat()ing pathnames for default values before parsing
          config file (Ron Gomes).
        - Fixed logging request and response headers on separate lines
          (Ron Gomes).
        - Fixed FTP Authentication message (Henrik Nordstrom).
        - Changed Proxy Authentication to trigger a reread of the passwd
          file if a password check fails (Henrik Nordstrom).
        - Changed FTP to retry the first CWD with a leading slash if it
          fails without one.

Changes to squid-1.2.beta5 (Nov 6, 1997):

        - Track the 'keep-alive ratio' for a peer as the ratio of
          the number of replies including 'Proxy-Connection: Keep-Alive'
          compared to the number of requests sent.  If the peer does
          not support Persistent connections then this ratio will tend
          toward zero.  If the ratio is less than 50% after 10 requests
          then we'll stop sending Keep-Alive.
        - Proper support for %nn escapes in FTP, and numerous
          other fixes (Henrik Nordstrom).
        - Support for Secure Hash Algorithm and framework for other
          hash functions as cache keys.
        - Fixed SSL snprintf() bug which broke SSL proxying.
        - Fixed store_dir swap log bug from reconfigure (SIGHUP).
        - Fixed LRU Reference Age bug.  The arg to pow() must be
          minutes, not seconds.

Changes to squid-1.2.beta4 (Oct 30, 1997):

        - Fixed DST bug in rfc1123.c
        - Changed default http_accel_port to 80.
        - added errorCon() as a ErrorState constructor function
          (Max Okumoto).
        - Added ERR_FTP_FAILURE message for ftpFail().
        - For FTP, the timeout callback must be moved to the 'data'
          descriptor when data transfer begins.  Otherwise we are
          likely to get a timeout on the control descriptor.
        - Fixed double-free bug in httpRequestFree().
        - Fixed store_swap_size counting bug in storeSwapOutHandle().

Changes to squid-1.2.beta3 (Oct 29, 1997):

        - Initialize _res.options to RES_DEFAULT in dnsserver.c.
        - Fix assertions which assumed 4-byte pointers.
        - Fix missing % in fqdncache.c snprintf().
        
Changes to squid-1.2.beta2 (Oct 28, 1997):

        - Fixed aiops.c and async_io.c so that they actually compile
          with USE_ASYNC_IO (Arjan de Vet).
        - Fixed errState->errno causing problems with some macros
          (Michael O'Reilly).
        - Fixed memory leaks in pconn.c (Max Okumoto).
        - Enhanced 'client' program with 'ping' behaviour (Ron Gomes).
        - Fixed InvokeHandlers() from calling memCopy() for ALL
          store_client's with callbacks.  A store_client might be reading
          from disk.
        - Rewrote storeMaintainSwapSpace().  No longer will we scan one
          bucket at a time.  Instead we'll maintain a single LRU
          list.  When an object is 'touched' we move it to the
          top of this list.  When we need disk space, we delete
          from the bottom.
        - Removed storeGetSwapSpace().
        
Changes to squid-1.2.beta1 ():

        - Reworked storage manager to not keep objects in memory during
          transit.  In other words, no separate NOVM distribution.
        - Lots of cleanup and debugging for beta release.
        - Use snprintf() everywhere instead of sprintf().
        - The 'in_memory' hash table has been replaced with a
          doubly-linked list.  New objects are added to the head of
          the list.  When memory space is needed, old objects are
          purged from the tail of the list.

Changes to squid-1.2.alpha7 ():

        - fixes fixes fixes.
        - Made Arjan's PROXY_AUTH ACL patch standard.

Changes to squid-1.2.alpha6 ():

        - Simpler cacheobj implementation.
        - persistent connection histogram
        - SERVER-SIDE PERSISTENT CONNECTIONS:
                - Added pconn.c 
                - Addec Cofig.Timeout.pconn; default 120 seconds
                - Added httpState->flags
                - Added flags arg to httpBuildRequestHeader()
                - Added HTTP_PROXYING and HTTP_KEEPALIVE flags
                - Added 'Connection' to allowed HTTP headers (http-anon.c)
                - Added 'Proxy-Connection' to allowed HTTP headers
                  (http-anon.c)
                - Merged proxyhttpStart() with httpStart() and created
                  new httpBuildState().
                - New httpPconnTransferDone() detects end-of-data on
                  persistent connections.

Changes to squid-1.2.alpha5 ():

        - New configuration system.  Everything is generated from
          'cf.data.pre', including the main parser, setting defaults,
          outputting current values, and freeing memory.  
          This also involved moving some of the local data structures
          (e.g. struct _acl *AclList in acl.c) to the Config
          structure.  (Max Okumoto)
        - No more '/i' for regular expressions.  Now insert a '-i'
          to switch to case-insensitive.  Use '+i' for case-sensitive.
        - When you have a variable named the same as its type, sizeof()
          gets the wrong one (fde).
        - Need to flush unbuffered logs before fork().
        - Added two fields swap log: refcount and e->flag.
        - Removed all the .h files for each .c file.  Now #include stuff
          is in either: defines.h, enums.h, typedefs.h, structs.h,
          or protos.h, globals.h.  This greatly reduces dependencies
          between the various source files.
        - globals.c is generated from globals.h by a Perl script.
        - Started customizable error texts.

Changes to squid-1.2.alpha4 ():

        - New MIME configuration, regular expression based
        - Added request_timeout config option
        - Multiple HTTP sockets (Lincoln Dale).
        - Moved 'fds_are_n_free' check to httpAccept().
        - s/USE_POLL/HAVE_POLL/; make poll() default if available.
        - Changed storeRegister to use offsets and make immediate
          callbacks if appropriate.
        - Removed icpDetectClientClose().  Some of that functionality
          goes into clientReadRequest() and the rest into
          httpRequestFree().
        - Moved IP lookups to commConnect stuff.
        - Added support for retrying connect().
        - New inline debug() macro (David Luyer).
        - Replace frequent gettimeofday() calls with alarm(3) based
          clock.  Need to add more gettimeofday() calls to get back
          high-resolution timestamp logging (Andres Kroonmaa).
        - Added support for Cache-control: proxy-revalidate;
          based on squid-1.1 patch from Mike Mitchell.

Changes to squid-1.2.alpha3 ():

        - Implemented persistent connections between clients and squid.
        - Moved various FD tables (comm.c, fdstat.c, disk.c) to a single
          table in fd.c.
        - Removed use of FD as an identifier in certain callback
          operations (ipcache, fqdncache).
        - General code cleanup.
        - Fixed typedefs for callback functions.
        - Removed FD lifetime/timeout dichotomy.  Now we only have
          timeouts, however the lifetime concept/keyword may still
          linger in certain places.
        - Change Makefile 'realclean' target to 'distclean'
        - Changed config file parsing of time specifications to use
          parseTimeLine().
        - Removed storetoString.c

Changes to squid-1.2.alpha2 ():

        - Merged squid-1.1.9, squid-1.1.10 changes

Changes to squid-1.2.alpha1 ():

        - Unified peer selection algorithm.
        - aiops.c and aiops.h are a threaded implementation of
          asynchronous file operations (Stewart Forster).
        - async_io.c and async_io.h are complete rewrites of the old
          versions (Stewart Forster).
        - Rewrote all disk file operations of squid to support
          the idea of callbacks except where not required (Stewart
          Forster).
        - Background validation of 'tainted' swap log entries (Stewart
          Forster).
        - Modified storeWriteCleanLog to create the log file using the
          open/write rather than fopen/printf (Stewart Forster).
        - Added the EINTR error response to handle badly interrupted
          system calls (Stewart Forster).
        - UDP_HIT_OBJ not supported, removed.
        - Different sized 'cache_dirs' supported.

==============================================================================