#5 NTLM auth scheme sent by proxy is neither skipped nor used

[Konstantin Khomoutov]

I connect through proxy server that requires either
NTLM or basic authorization. When client connects,
request for NTLM auth is sent first (as required for IE
and other NTLM-aware programs to do "transparent"
auth.), if the client *rejects* it, proxy sends request
for basic auth.

The bug I think is that when RSS Feeder gets reuqest
for NTLM auth (which I admit it doesn't support) it
just reports it (as "(407) Proxy Authentication
Required") without checking what kind of auth. is
requested and thus without re-trying to get a chance of
proper authentication using basic scheme.