[Pidgin] #11986: Separate HTTP and IM proxy servers no longer work in 2.7.0

[Pidgin]

#11986: Separate HTTP and IM proxy servers no longer work in 2.7.0
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 Reporter:  psmith2100  |        Owner:  rekkanoryo  
     Type:  defect      |       Status:  new         
Milestone:              |    Component:  unclassified
  Version:  2.7.0       |   Resolution:              
 Keywords:              |  
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Comment(by datallah at pidgin.im):

 (In [baeaaf7de69d9f99b7545dda73f219292c4dd106]):[[BR]]
 Attempt to improve handling of HTTP requests on port 80 when there is a
 HTTP
 proxy that requires authentication involved.
 This also has a fix to make sure that we continue to use the same proxy
 when
 we are redirected to an alternative URL.
 I'm tempted to create a purple_proxy_append_proxy_auth_headers(), but that
 would have to wait until 2.8.0.
 Refs #11986.
 Refs #11908.

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Ticket URL: <http://developer.pidgin.im/ticket/11986#comment:50>
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