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1 | <!doctype linuxdoc system> | |
2 | <article> | |
3 | <title>Squid 3.4.10 release notes</title> | |
4 | <author>Squid Developers</author> | |
5 | ||
6 | <abstract> | |
7 | This document contains the release notes for version 3.4 of Squid. | |
8 | Squid is a WWW Cache application developed by the National Laboratory | |
9 | for Applied Network Research and members of the Web Caching community. | |
10 | </abstract> | |
11 | ||
12 | <toc> | |
13 | ||
14 | <sect>Notice | |
15 | <p> | |
16 | The Squid Team are pleased to announce the release of Squid-3.4.10 for testing. | |
17 | ||
18 | This new release is available for download from <url url="http://www.squid-cache.org/Versions/v3/3.4/"> or the | |
19 | <url url="http://www.squid-cache.org/Mirrors/http-mirrors.html" name="mirrors">. | |
20 | ||
21 | <p>Some interesting new features adding system flexibility have been added along with general improvements all around. | |
22 | While this release is not fully bug-free we believe it is ready for use in production on many systems. | |
23 | ||
24 | <p>We welcome feedback and bug reports. If you find a bug, please see <url url="http://wiki.squid-cache.org/SquidFaq/BugReporting"> | |
25 | for how to submit a report with a stack trace. | |
26 | ||
27 | <sect1>Known issues | |
28 | <p> | |
29 | Although this release is deemed good enough for use in many setups, please note the existence of | |
30 | <url url="http://bugs.squid-cache.org/buglist.cgi?query_format=advanced&product=Squid&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&version=3.4" name="open bugs against Squid-3.4">. | |
31 | ||
32 | <sect1>Changes since earlier releases of Squid-3.4 | |
33 | <p> | |
34 | The 3.4 change history can be <url url="http://www.squid-cache.org/Versions/v3/3.4/changesets/" name="viewed here">. | |
35 | ||
36 | ||
37 | <sect>Major new features since Squid-3.3 | |
38 | <p>Squid 3.4 represents a new feature release above 3.3. | |
39 | ||
40 | <p>The most important of these new features are: | |
41 | <itemize> | |
42 | <item>Helper protocol extensions | |
43 | <item>SSL Server Certificate Validator | |
44 | <item>Store-ID | |
45 | <item>TPROXY Support for OpenBSD 5.1+ and FreeBSD 9+ | |
46 | <item>Transaction Annotations | |
47 | <item>Multicast DNS | |
48 | </itemize> | |
49 | ||
50 | Most user-facing changes are reflected in squid.conf (see below). | |
51 | ||
52 | ||
53 | <sect1>Helper protocol extensions | |
54 | <p>Details at <url url="http://wiki.squid-cache.org/Features/AddonHelpers">. | |
55 | ||
56 | <p>The Squid helper protocol used to communicate with authenticators, | |
57 | URL-rewriters, Redirectors, and External ACL helpers has been updated | |
58 | and extended. | |
59 | ||
60 | <p><em>BH</em> status code is now accepted from all helpers to report | |
61 | internal error events separate from <em>ERR</em> rejection code. | |
62 | Permitting Squid to perform recovery operations specific to | |
63 | helper failure instead of a blanket client rejection. | |
64 | ||
65 | <p>Arbitrary key-value pairs can be returned from any helper. | |
66 | Allowing future helpers to be forward- and backward- compatible | |
67 | with this and future versions of Squid. | |
68 | ||
69 | ||
70 | <sect1>SSL Server Certificate Validator | |
71 | <p>Details at <url url="http://wiki.squid-cache.org/Features/SslServerCertValidator">. | |
72 | ||
73 | <p>The helper consulted after the internal OpenSSL validation, regardless of the | |
74 | validation results. The helper will receive: | |
75 | ||
76 | <itemize> | |
77 | <item>the origin server certificate (chain), | |
78 | <item>the intended domain name, and | |
79 | <item>a list of OpenSSL validation errors (if any). | |
80 | </itemize> | |
81 | ||
82 | <p>If the helper decides to honor an OpenSSL error or report another validation | |
83 | error(s), the helper will return: | |
84 | ||
85 | <itemize> | |
86 | <item>A list of certificates. | |
87 | <item>A list of items consists the the validation error name (see <em>%err_name</em> | |
88 | error page macro and <em>%err_details</em> code for <em>logformat</em>), error reason | |
89 | (<em>%ssl_lib_error macro</em>), and the offending certificate. | |
90 | </itemize> | |
91 | ||
92 | <p>The returned information mimics what the internal OpenSSL-based validation code | |
93 | collects now. Returned errors, if any, are fed to <em>sslproxy_cert_error</em>, | |
94 | triggering the existing SSL error processing code. | |
95 | ||
96 | <p>The helper invocation controlled by the <em>sslcrtvalidator_program</em> and | |
97 | <em>sslcrtvalidator_children</em> configurations options which are similar to the | |
98 | <em>ssl_crtd</em> related options. | |
99 | ||
100 | ||
101 | <sect1>Store-ID | |
102 | <p>Details at <url url="http://wiki.squid-cache.org/Features/StoreID">. | |
103 | ||
104 | <p>This feature is a redesigned equivalent to the Squid-2.7 feature known as StoreURL-rewrite. | |
105 | ||
106 | <p><em>Notice</em> that this is not a direct portage of the Squid-2.7 feature so behaviour | |
107 | differences do exist. Although the new feature works in similar enough ways that the old | |
108 | helper scripts used for Squid-2.7 are expected to work in this and later versions of Squid. | |
109 | ||
110 | <p>Squid traditionally uses the requested URL as an index key ID to locate objects in cache. | |
111 | It is not the only key possible and the Store-ID feature exposes an API for external | |
112 | helpers to provide Squid with an alternative key name for any URL. | |
113 | ||
114 | <p>When any client request is received which requires a cache lookup the URL is passed to | |
115 | a helper specified with the <em>store_id_program</em> directive to check for an alternative | |
116 | Store ID. This allows the helper to identify URLs which refer to duplicate resources and | |
117 | de-duplicate the cache content. <em>store_id_access</em> is provided to allow ACL-based | |
118 | tuning of which traffic gets sent to the helper and reduce overheads. | |
119 | ||
120 | <p>One subtle and noteworthy difference between Squid-2 and Squid-3 which is highlighted by | |
121 | this feature is that <em>refresh_pattern</em> applies its regex argument against the Store | |
122 | ID key and not the transaction URL. So using the Store-ID feature to alter the value | |
123 | affects which <em>refresh_pattern</em> directive will be matched. | |
124 | ||
125 | <p>Store-ID helpers bundled with Squid can be built with the --enable-storeid-rewrite-helpers | |
126 | option which is added in this version. Currently there is a <em>file</em> helper | |
127 | provided. | |
128 | ||
129 | ||
130 | <sect1>TPROXY Support for OpenBSD 5.1+ and FreeBSD 9+ | |
131 | <p>Details at <url url="http://wiki.squid-cache.org/ConfigExamples/Intercept/OpenBsdPf">. | |
132 | ||
133 | <p>The Packet Filter (PF) firewall in OpenBSD 4.4 and later offers traffic interception | |
134 | using several very simple methods. One of which is the <em>divert-to</em> rule type | |
135 | which acts as a simple routing diversion instead of performing NAT packet alterations. | |
136 | ||
137 | <p>The IP Firewall (IPFW) on FreeBSD 9+ contains a port of the Linux Netfilter TPROXY feature. | |
138 | ||
139 | <p>This version of Squid adds support for these features through the ./configure | |
140 | options --enable-pf-transparent and --enable-ipfw-transparent when Squid is built on | |
141 | systems with the required support. No special extras are required to enable | |
142 | <em>http_port ... tproxy</em> configuration to work. | |
143 | ||
144 | <p>NOTE: To resolve NAT lookup issues on recent PF firewall versions the code behind | |
145 | <em>./configure --enable-pf-transparent</em> has been altered and is expected to | |
146 | break on the version of PF firewall shipped with BSD systems such as NetBSD and FreeBSD | |
147 | which do not yet support the getsockname() API. | |
148 | These systems require <em>--with-nat-devpf</em> to enable /dev/pf support when using PF firewall. | |
149 | ||
150 | ||
151 | <sect1>Transaction Annotations | |
152 | <p>Previously the only annotation methods available were ICAP/eCAP HTTP header insertions | |
153 | or external ACL <em>tag=</em> result code. Each of which had only limited possibilities | |
154 | for use and little or no correlation. | |
155 | ||
156 | <p>It is now possible to add annotations to a client transaction from several sources: | |
157 | <itemize> | |
158 | <item> Directly from squid.conf using the <em>note</em> directive with | |
159 | ACL-based selection of which annotation is linked to any | |
160 | particular transaction. | |
161 | ||
162 | <item> By configured helper processes returning a key=value pair. | |
163 | The key name becomes the annotation name. | |
164 | </itemize> | |
165 | ||
166 | <p>Annotations on the transaction can be passed to ICAP services or eCAP modules using the | |
167 | <em>adaptation_meta</em> directive to send them as headers. | |
168 | They can also be logged using the <em>%note</em> log format code in custom logs. With | |
169 | the new helper response syntax changes this means all helper response key=value details | |
170 | such as URL-rewrite or store-id changes, external ACL tag etc. are now able to be logged. | |
171 | ||
172 | <p>Annotations which are already assigned to a transaction can be checked using an ACL test | |
173 | of the new <em>note</em> ACL type. This can match a particular note by name and value, | |
174 | of for any notes with a given name. | |
175 | ||
176 | <p>NOTE: not all helper interfaces are yet enabled to convert key=value into annotations | |
177 | and the external ACL interface does not yet send annotations to the helper. | |
178 | ||
179 | ||
180 | <sect1>Multicast DNS | |
181 | <p>The internal DNS component of Squid now supports multicast DNS (mDNS) resolution in | |
182 | accordance with RFC 6762. | |
183 | ||
184 | <p>The <em>dns_multicast_local</em> directive must be set to <em>on</em> to enable this | |
185 | feature. | |
186 | ||
187 | <p>The multicast DNS group IP addresses for IPv4 and IPv6 resolving are added to the set | |
188 | of available DNS resolvers and used automatically for domain names ending in <em>.local</em> | |
189 | and reverse-DNS lookups before attempting a secondary resolution on the configured | |
190 | resolvers. Domains without <em>.local</em> are resolved using only the configured resolvers. | |
191 | ||
192 | <p>Statistics for multicast DNS resolution can be found on the <em>idns</em> cache manager | |
193 | report. | |
194 | ||
195 | <p><em>NOTE</em> that the external DNS helper interface is now deprecated and has been | |
196 | removed from future Squid versions. Any installations still using it for local hostname | |
197 | resolution need to upgrade to mDNS resolution with this Squid version. | |
198 | ||
199 | ||
200 | <sect>Changes to squid.conf since Squid-3.3 | |
201 | <p> | |
202 | There have been changes to Squid's configuration file since Squid-3.3. | |
203 | ||
204 | <p>Squid supports reading configuration option parameters from external | |
205 | files using the syntax <em>parameters("/path/filename")</em>. For example: | |
206 | <verb> | |
207 | acl whitelist dstdomain parameters("/etc/squid/whitelist.txt") | |
208 | </verb> | |
209 | ||
210 | <p>There have also been changes to individual directives in the config file. | |
211 | ||
212 | This section gives a thorough account of those changes in three categories: | |
213 | ||
214 | <itemize> | |
215 | <item><ref id="newtags" name="New tags"> | |
216 | <item><ref id="modifiedtags" name="Changes to existing tags"> | |
217 | <item><ref id="removedtags" name="Removed tags"> | |
218 | </itemize> | |
219 | <p> | |
220 | ||
221 | <sect1>New tags<label id="newtags"> | |
222 | <p> | |
223 | <descrip> | |
224 | <tag>configuration_includes_quoted_values</tag> | |
225 | <p>Whether Squid supports directive parameters with spaces, quotes, and other | |
226 | special characters. Surround such parameters with "double quotes" and | |
227 | also set this directive on/off around the relevant squid.conf line(s) | |
228 | making use of such quoting. | |
229 | ||
230 | <tag>dns_multicast_local</tag> | |
231 | <p>Use multicast DNS for <em>.local</em> domains and reverse-DNS resolution. | |
232 | ||
233 | <tag>note</tag> | |
234 | <p>Use ACLs to annotate a transaction with customized annotations | |
235 | which can be logged in access.log | |
236 | ||
237 | <tag>spoof_client_ip</tag> | |
238 | <p>Access control to determine whether to disable the TPROXY spoofing on upstream traffic. | |
239 | ||
240 | <tag>sslcrtvalidator_children</tag> | |
241 | <p>Specifies the settings for how many SSL server certificate | |
242 | validator helpers are run and when they are started. | |
243 | ||
244 | <tag>sslcrtvalidator_program</tag> | |
245 | <p>Specifies the location of a SSL server certificate validator helper. | |
246 | ||
247 | <tag>store_id_access</tag> | |
248 | <p>Whether the URL for a given request is passed to the Store-ID helper process. | |
249 | Used to improve StoreID performance by quickly eliminating helper delays using ACL tests. | |
250 | <p>Ported equivalent to <em>storeurl_access</em> from 2.7 | |
251 | ||
252 | <tag>store_id_bypass</tag> | |
253 | <p>Whether the StoreID helper may be bypassed when overloaded. | |
254 | ||
255 | <tag>store_id_children</tag> | |
256 | <p>Controls the number of StoreID helper processes. | |
257 | <p>Options <em>startup=N</em>, <em>idle=N</em>, <em>concurrency=N</em> | |
258 | <itemize> | |
259 | <item>startup=N allow finer tuning of how many helpers are started initially. | |
260 | <item>idle=N allow fine tuning of how many helper to retain as buffer against sudden traffic loads. | |
261 | <item>concurrency=N was previously called url_rewrite_concurrency as a distinct directive. | |
262 | </itemize> | |
263 | ||
264 | <tag>store_id_rewrite_program</tag> | |
265 | <p>A helper program to provide cache storage internal key ID value for a request. | |
266 | <p>Ported equivalent to <em>storeurl_rewrite_program</em> from 2.7 | |
267 | ||
268 | </descrip> | |
269 | ||
270 | <sect1>Changes to existing tags<label id="modifiedtags"> | |
271 | <p> | |
272 | <descrip> | |
273 | <tag>access_log</tag> | |
274 | <p>Configuration syntax extended to support name=value options. | |
275 | <em>New Syntax:</em> access_log module:place [option ...] [acl ...] | |
276 | <p>New option <em>logformat=</em> to specify the logging format name. | |
277 | <p>New option <em>buffer-size=</em> to specify how large the log buffer | |
278 | for this log is to be when <em>buffered_logs</em> is enabled. | |
279 | <p>New option <em>on-error=</em> to specify what handling is to be done | |
280 | if the logging module encounters a non-recoverable error writing logs. | |
281 | With the value <em>die</em> (the default) Squid halts operation. | |
282 | With the value <em>drop</em> Squid drops log lines and continue running. | |
283 | ||
284 | <tag>acl</tag> | |
285 | <p>New test type <em>server_cert_fingerprint</em> to match against | |
286 | server SSL certificate fingerprint. | |
287 | <p>New test type <em>note</em> to match against transaction annotations | |
288 | by name and value, or just by name. | |
289 | <p>New test type <em>any-of</em> to match if any one of a set of named ACLs. | |
290 | <p>New test type <em>all-of</em> to match against all of a set of named ACLs. | |
291 | ||
292 | <tag>auth_param</tag> | |
293 | <p>New result code <em>BH</em> to signal helper internal errors | |
294 | available in all authentication schemes. | |
295 | <p>New key <em>message=</em> for error message details in all authentication schemes. | |
296 | <p>New result code <em>OK</em> and key <em>ha1=</em> in Digest authentication. | |
297 | <p>New result codes <em>OK</em>, <em>ERR</em> replace result codes <em>AF</em>, | |
298 | and <em>NA</em> in NTLM and Negotiate authentication. | |
299 | <p>New key <em>token=</em> for NTLM and Negotiate authentication <em>OK</em> responses. | |
300 | <p>Details at <url url="http://wiki.squid-cache.org/Features/AddonHelpers">. | |
301 | ||
302 | <tag>external_acl_type</tag> | |
303 | <p>Deprecated <em>protocol=3.0</em> option. No longer necessary. | |
304 | <p>New result code <em>BH</em> to signal helper internal errors | |
305 | <p>Details at <url url="http://wiki.squid-cache.org/Features/AddonHelpers">. | |
306 | ||
307 | <tag>http_port</tag> | |
308 | <p>Support IPv6 for <em>intercept</em> mode. Requires ip6tables support on Linux, | |
309 | PF support on OpenBSD and IPFW support on FreeBSD. Squid will no longer complain | |
310 | about misconfiguration if IPv6 support is missing, we now rely on the firewall | |
311 | tools reporting misconfiguration when the NAT rules are created. | |
312 | <p>Support <em>tproxy</em> mode traffic on BSD systems with BINDANY support | |
313 | (OpenBSD 5+, FreeBSD 9+ so far). | |
314 | <p>Changed build options behind <em>intercept</em> traffic mode handling on BSD. | |
315 | see <em>--enable-pf-transparent</em> for more details. | |
316 | ||
317 | <tag>logformat</tag> | |
318 | <p>New format code <em>%note</em> to log a transaction annotation linked to the | |
319 | transaction by ICAP, eCAP, a helper, or the <em>note</em> squid.conf directive. | |
320 | <p>New format code <em>%>qos</em> to log client connection TOS/DSCP value set by Squid. | |
321 | <p>New format code <em>%<qos</em> to log server connection TOS/DSCP value set by Squid. | |
322 | <p>New format code <em>%>nfmark</em> to log client connection netfilter mark set by Squid. | |
323 | <p>New format code <em>%<nfmark</em> to log server connection netfilter mark set by Squid. | |
324 | ||
325 | <tag>pipeline_prefetch</tag> | |
326 | <p>Updated to take a numeric count of prefetched pipeline requests instead of ON/OFF. | |
327 | ||
328 | <tag>refresh_pattern</tag> | |
329 | <p><em>NOTE:</em> the regular expression pattern operates on the cache Store-ID value. | |
330 | Which by default is identical to the requested URL, but may differ for some | |
331 | objects if the Store-ID feature is in use. | |
332 | ||
333 | <tag>unlinkd_program</tag> | |
334 | <p>New helper response format utilizing result codes <em>OK</em> and <em>BH</em>, | |
335 | to signal helper lookup results. Also, key-value response values to return | |
336 | multiple values to Squid. | |
337 | <p>Details at <url url="http://wiki.squid-cache.org/Features/AddonHelpers">. | |
338 | ||
339 | <tag>url_rewrite_program</tag> | |
340 | <p>New helper response format utilizing result codes <em>OK</em>, <em>ERR</em>, | |
341 | and <em>BH</em> to signal helper lookup results. Also, key-value response | |
342 | values to return multiple values to Squid. | |
343 | <p>Details at <url url="http://wiki.squid-cache.org/Features/AddonHelpers">. | |
344 | ||
345 | </descrip> | |
346 | ||
347 | <sect1>Removed tags<label id="removedtags"> | |
348 | <p> | |
349 | <descrip> | |
350 | <tag>storeurl_access</tag> | |
351 | <p>Replaced by <em>store_id_access</em>. | |
352 | ||
353 | <tag>storeurl_rewrite_children</tag> | |
354 | <p>Replaced by <em>store_id_children</em>. | |
355 | ||
356 | <tag>storeurl_rewrite_concurrency</tag> | |
357 | <p>Replaced by <em>store_id_children</em> with <em>concurrency=N</em> option. | |
358 | ||
359 | <tag>storeurl_rewrite_program</tag> | |
360 | <p>Replaced by <em>store_id_program</em>. | |
361 | ||
362 | </descrip> | |
363 | ||
364 | ||
365 | <sect>Changes to ./configure options since Squid-3.3 | |
366 | <p> | |
367 | There have been some changes to Squid's build configuration since Squid-3.3. | |
368 | ||
369 | This section gives an account of those changes in three categories: | |
370 | ||
371 | <itemize> | |
372 | <item><ref id="newoptions" name="New options"> | |
373 | <item><ref id="modifiedoptions" name="Changes to existing options"> | |
374 | <item><ref id="removedoptions" name="Removed options"> | |
375 | </itemize> | |
376 | ||
377 | ||
378 | <sect1>New options<label id="newoptions"> | |
379 | <p> | |
380 | <descrip> | |
381 | <tag>--enable-storeid-rewrite-helpers</tag> | |
382 | <p>New option to control which Store-ID helpers are built. As with other | |
383 | helper options use --disable-* to prevent any helpers building and | |
384 | omit to get all helper auto-detected. | |
385 | <p>Currenly only a helper using <em>file</em> for backend is provided. | |
386 | ||
387 | <tag>--disable-arch-native</tag> | |
388 | <p>New option to disable use of -march=native compiler flag. | |
389 | <p>The new flag auto-enables CPU-specific optimizations in GCC and is | |
390 | required by Clang++ v3.2 for correct 64-bit environment detection. | |
391 | It does not always work well however, so this build option is provided | |
392 | to remove it when necessary. | |
393 | ||
394 | <tag>--with-nat-devpf</tag> | |
395 | <p>New option to alter the behaviour of <em>http_port ... intercept</em> option | |
396 | in squid.conf. | |
397 | <p>When this option is used Squid performs the /dev/pf lookups required to | |
398 | support PF <em>rdr-to</em> rules. Otherwise Squid will perform perform the | |
399 | getsockname() API calls to support PF <em>divert-to</em> rules. | |
400 | <p>NOTE: systems such as NetBSD and FreeBSD which do not yet support | |
401 | the getsockname() API in recent PF versions require this option. | |
402 | ||
403 | </descrip> | |
404 | ||
405 | <sect1>Changes to existing options<label id="modifiedoptions"> | |
406 | <p> | |
407 | <descrip> | |
408 | <tag>--enable-pf-transparent</tag> | |
409 | <p>NAT table support updated to use the getsockname() API provided by the | |
410 | latest PF versions <em>divert-to</em>. This allows <em>http_port</em> | |
411 | in squid.conf to support both <em>intercept</em> and <em>tproxy</em> traffic | |
412 | and to silence NAT lookup failure messages on recent BSD. | |
413 | <p>NOTE: systems such as NetBSD and FreeBSD which do not yet support | |
414 | the getsockname() API in recent PF versions require <em>--with-nat-devpf</em> | |
415 | to re-enable /dev/pf support when using PF firewall. | |
416 | ||
417 | <tag>--disable-translation</tag> | |
418 | <p>Default changed to prevent translating error page templates during build. | |
419 | Use --enable-translation to explicitly build and install the templates. | |
420 | <p>The latest pre-translated templates can be downloaded from <url url="http://www.squid-cache.org/Versions/langpack/"> | |
421 | ||
422 | </descrip> | |
423 | </p> | |
424 | ||
425 | <sect1>Removed options<label id="removedoptions"> | |
426 | <p> | |
427 | <descrip> | |
428 | <p><em>There are no removed ./configure options in Squid-3.4.</em> | |
429 | ||
430 | </descrip> | |
431 | ||
432 | ||
433 | <sect>Regressions since Squid-2.7 | |
434 | ||
435 | <p>Some squid.conf options which were available in Squid-2.7 are not yet available in Squid-3.4 | |
436 | ||
437 | <p>If you need something to do then porting one of these from Squid-2 to Squid-3 is most welcome. | |
438 | ||
439 | <sect1>Missing squid.conf options available in Squid-2.7 | |
440 | <p> | |
441 | <descrip> | |
442 | <tag>broken_vary_encoding</tag> | |
443 | <p>Not yet ported from 2.6 | |
444 | ||
445 | <tag>cache_dir</tag> | |
446 | <p><em>COSS</em> storage type is lacking stability fixes from 2.6 | |
447 | <p>COSS <em>overwrite-percent=</em> option not yet ported from 2.6 | |
448 | <p>COSS <em>max-stripe-waste=</em> option not yet ported from 2.6 | |
449 | <p>COSS <em>membufs=</em> option not yet ported from 2.6 | |
450 | <p>COSS <em>maxfullbufs=</em> option not yet ported from 2.6 | |
451 | ||
452 | <tag>cache_peer</tag> | |
453 | <p><em>idle=</em> not yet ported from 2.7 | |
454 | <p><em>monitorinterval=</em> not yet ported from 2.6 | |
455 | <p><em>monitorsize=</em> not yet ported from 2.6 | |
456 | <p><em>monitortimeout=</em> not yet ported from 2.6 | |
457 | <p><em>monitorurl=</em> not yet ported from 2.6 | |
458 | ||
459 | <tag>cache_vary</tag> | |
460 | <p>Not yet ported from 2.6 | |
461 | ||
462 | <tag>collapsed_forwarding</tag> | |
463 | <p>Not yet ported from 2.6 | |
464 | ||
465 | <tag>error_map</tag> | |
466 | <p>Not yet ported from 2.6 | |
467 | ||
468 | <tag>external_refresh_check</tag> | |
469 | <p>Not yet ported from 2.7 | |
470 | ||
471 | <tag>location_rewrite_access</tag> | |
472 | <p>Not yet ported from 2.6 | |
473 | ||
474 | <tag>location_rewrite_children</tag> | |
475 | <p>Not yet ported from 2.6 | |
476 | ||
477 | <tag>location_rewrite_concurrency</tag> | |
478 | <p>Not yet ported from 2.6 | |
479 | ||
480 | <tag>location_rewrite_program</tag> | |
481 | <p>Not yet ported from 2.6 | |
482 | ||
483 | <tag>refresh_pattern</tag> | |
484 | <p><em>stale-while-revalidate=</em> not yet ported from 2.7 | |
485 | <p><em>ignore-stale-while-revalidate=</em> not yet ported from 2.7 | |
486 | <p><em>negative-ttl=</em> not yet ported from 2.7 | |
487 | ||
488 | <tag>refresh_stale_hit</tag> | |
489 | <p>Not yet ported from 2.7 | |
490 | ||
491 | <tag>update_headers</tag> | |
492 | <p>Not yet ported from 2.7 | |
493 | ||
494 | </descrip> | |
495 | ||
496 | <sect>Copyright | |
497 | <p> | |
498 | Copyright (C) 1996-2015 The Squid Software Foundation and contributors | |
499 | <p> | |
500 | Squid software is distributed under GPLv2+ license and includes | |
501 | contributions from numerous individuals and organizations. | |
502 | Please see the COPYING and CONTRIBUTORS files for details. | |
503 | ||
504 | </article> |