urllib2: correct way how to add a header to the *initial* request?

[Matěj Cepl]

Hi,

this is probably a dumb question but I just cannot find a way 
how to create AuthHandler which would add Authorization header 
to the FIRST request. The only thing I see in urllib2.py are 
various http_error handler which add Authorization header to the 
ADDITIONAL request which handles the error.

However, when looking at http://www.ietf.org/rfc/rfc2617.txt, 
section 2, I see this:

       A client MAY preemptively send the corresponding 
       Authorization header with requests for resources in that 
       space without receipt of another challenge from the server.

And really many servers (e.g., api.github.com) expect the 
Authorization header to be sent with the initial request, and 
actually they broken 
(http://developer.github.com/v3/auth/#basic-authentication) so 
instead of 401 they send 404 status code.  

Anybody has any idea how to subclass *AuthHandler so that it 
would add the header on the initial request?

Best,

Matěj
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