D-Programming-Language/phobos — pull request #2581 by schuetzm (2014-10-03 11:12:09+00:00)
Title: Add setProxyAuthentication() in std.net.curl

http://forum.dlang.org/thread/uuwxugavmrgdbyonhblk@forum.dlang.org

Unfortunately I cannot test this myself, as I don't have a proxy requiring authentication at hand.