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Just a note that my justification of 
Request.add_unredirected_hdrs above makes no sense. :-/ I 
mis-remembered my own reasons for adding this.  My original 
comment from 759792 is correct: 
 
Some headers (Content-Length, Referer, ...) mustn't be copied 
to requests for a redirected URL. This requires the addition of a 
new dict to Request. I've added an add_unredirected_headers 
method, too. The old implementation just sends these headers 
directly, but that's not possible if you want to use procesors to 
implement these things.