This patch fixes the code to handle HTTP/1.0 proxies which do not keep the connection alive after a single request. If a HTTPTrafficFilter returns a new header reply, the HTTP CONNECT proxy code will issue the request over a new connection. The final connection is kept alive, as it used for the persistent connection forwarding. In addition, the response status line is now passed to the HTTPTrafficFilter handling method to provide ability to act upon the response status code. Missing passthrough of the HTTPTrafficFilter object the down the stack to the HTTPConnectProxiedConnection is added. Test-Information: Added a unit test following an NTLM HTTP proxy authentication with a static HTTPTrafficFilter. This and other unit tests still pass. Change-Id: Ida0d1aec08a60f10c1480e1eecaecbd3f87b0dca