1.18 try next proxy if one doesn't work
1.19 provide timing info for each redirect
1.20 SRV and URI DNS records
+ 1.21 netrc caching and sharing
1.22 CURLINFO_PAUSE_STATE
1.23 Offer API to flush the connection pool
1.24 TCP Fast Open for windows
Offer support for resolving SRV and URI DNS records for libcurl to know which
server to connect to for various protocols (including HTTP!).
+1.21 netrc caching and sharing
+
+ The netrc file is read and parsed each time a connection is setup, which
+ means that if a transfer needs multiple connections for authentication or
+ redirects, the file might be reread (and parsed) multiple times. This makes
+ it impossible to provide the file as a pipe.
+
1.22 CURLINFO_PAUSE_STATE
Return information about the transfer's current pause state, in both