[issue12455] urllib2 forces title() on header names, breaking some requests

[karl]

karl added the comment:

tests in http://hg.python.org/cpython/file/886df716cd09/Lib/test/test_wsgiref.py#l370 also checking that everything is case insensitive. 

And the method to get the headers in wsgiref, make sure they are lower-case
http://hg.python.org/cpython/file/886df716cd09/Lib/wsgiref/headers.py#l82

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