See Empathy bug report: http://bugzilla.gnome.org/show_bug.cgi?id=547251
Seems loudmouth supports proxy user and password, so we should add "https-proxy-user" and "https-proxy-password" parameters to Gabble and make use of them when connecting.
Gabble now uses Wocky which is based on GIO. GIO has gain proxy support (SOCKS5/4a/4) since version 2.26 and I'm working in Wocky to add HTTP Connect proxy support. The code is under review.
All code has been merged.
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