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Bug: https://github.com/bagder/curl/pull/168 (trynextip) - Don't try the "other" protocol family unless IPv6 is available. In an IPv4-only build the other family can only be IPv6 which is unavailable. This change essentially stops IPv4-only builds from attempting the "happy eyeballs" secondary parallel connection that is supposed to be used by the "other" address family. Prior to this change in IPv4-only builds that secondary parallel connection attempt could be erroneously used by the same family (IPv4) which caused a bug where every address after the first for a host could be tried twice, often in parallel. This change fixes that bug. An example of the bug is shown below. Assume MTEST resolves to 3 addresses 127.0.0.2, 127.0.0.3 and 127.0.0.4: * STATE: INIT => CONNECT handle 0x64f4b0; line 1046 (connection #-5000) * Rebuilt URL to: http://MTEST/ * Added connection 0. The cache now contains 1 members * STATE: CONNECT => WAITRESOLVE handle 0x64f4b0; line 1083 (connection #0) * Trying 127.0.0.2... * STATE: WAITRESOLVE => WAITCONNECT handle 0x64f4b0; line 1163 (connection #0) * Trying 127.0.0.3... * connect to 127.0.0.2 port 80 failed: Connection refused * Trying 127.0.0.3... * connect to 127.0.0.3 port 80 failed: Connection refused * Trying 127.0.0.4... * connect to 127.0.0.3 port 80 failed: Connection refused * Trying 127.0.0.4... * connect to 127.0.0.4 port 80 failed: Connection refused * connect to 127.0.0.4 port 80 failed: Connection refused * Failed to connect to MTEST port 80: Connection refused * Closing connection 0 * The cache now contains 0 members * Expire cleared curl: (7) Failed to connect to MTEST port 80: Connection refused The bug was born in commit bagder/curl@2d435c7. |
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_ _ ____ _ ___| | | | _ \| | / __| | | | |_) | | | (__| |_| | _ <| |___ \___|\___/|_| \_\_____| README Curl is a command line tool for transferring data specified with URL syntax. Find out how to use curl by reading the curl.1 man page or the MANUAL document. Find out how to install Curl by reading the INSTALL document. libcurl is the library curl is using to do its job. It is readily available to be used by your software. Read the libcurl.3 man page to learn how! You find answers to the most frequent questions we get in the FAQ document. Study the COPYING file for distribution terms and similar. If you distribute curl binaries or other binaries that involve libcurl, you might enjoy the LICENSE-MIXING document. CONTACT If you have problems, questions, ideas or suggestions, please contact us by posting to a suitable mailing list. See http://curl.haxx.se/mail/ All contributors to the project are listed in the THANKS document. WEB SITE Visit the curl web site for the latest news and downloads: http://curl.haxx.se/ GIT To download the very latest source off the GIT server do this: git clone git://github.com/bagder/curl.git (you'll get a directory named curl created, filled with the source code) NOTICE Curl contains pieces of source code that is Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan. This notice is included here to comply with the distribution terms.