+ help
+ Enable HTTP over unix domain sockets.
+ To use this with the curl command line, you specify the socket path to the new --unix-domain option.
+ This feature is actually not limited to HTTP, you can do all the TCP-based protocols
+ except FTP over the unix domain socket, but it is only HTTP that is regularly used this way.
+ The reason FTP isn't supported is of course its use of two connections
+ which would be even weirder to do like this.