[Pidgin] #17196: Support Kerberos authentication against proxy server

[Pidgin]

#17196: Support Kerberos authentication against proxy server
-------------------------+--------------------------
 Reporter:  iliyap       |      Owner:  EionRobb
     Type:  enhancement  |     Status:  new
Milestone:  2.12.1       |  Component:  unclassified
  Version:  2.10.7       |   Keywords:
-------------------------+--------------------------
 Our corporate proxy server supports Kerberos authentication using HTTP
 Negotiate authentication method. When I set this proxy address in global
 proxy server preferences, I receive following error (for example, from ICQ
 account):

 {{{
 Error requesting https://api.login.icq.net/auth/clientLogin:
 Unable to connect to api.login.icq.net: SSL Connection Failed
 }}}

 As far as I know pidgin and libpurple use libcurl library. I've checked
 that curl can download through proxy using Kerberos authentication:

 {{{
 curl --proxy-negotiate -U : https://pidgin.im
 }}}

 Please support Kerberos authentication against HTTP proxy server.

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Ticket URL: <https://developer.pidgin.im/ticket/17196>
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