The ability to use UNIX sockets will be available in 7.40. You did mention FTP, but AFAIK there is no FTP software that uses UNIX sockets. FTP has quite a hard dependency on TCP/IP given that both active and passive mode advertises a port.

Besides HTTP, IMAP/POP3/SMTP (e.g. nginx) should be supported though (but no tests have been added for that).

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** [feature-requests:#53] Allow connecting via UNIX local domain sockets**
**Status:** open
**Labels:** libcurl 
**Created:** Tue Sep 28, 2010 05:38 AM UTC by Andrei Tarassov
**Last Updated:** Fri Jan 10, 2014 12:48 PM UTC
**Owner:** Daniel Stenberg
TCP sockets are just one way to provide access to HTTP/FTP and proxy servers. On UNIX there is also another type of sockets: UNIX local domain. In certain scenarios one may want to configure a web server or, more interestingly, a proxy server to listen to a UNIX local domain socket. For example, a special proxy server could perform extra complicated processing on the client machine \(custom authentication, custom filtering, custom caching\) before forwarding the request to the target server.
It would be good if libcurl \(as well as the command line curl\) could be configured to connect to the target server via a UNIX local domain socket rather than a TCP socket.
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