[issue2275] urllib2 header capitalization

[John J Lee]

John J Lee <jjlee at users.sourceforge.net> added the comment:

The CaseInsensitive dict class fails to preserve its invariants (implied
invariants, since there are no tests for it).  There are also problems
with the documentation in the patch.  I will submit a modified patch, I
hope later this week.

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<http://bugs.python.org/issue2275>
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