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It's much easier to get a patch integrated since there
should be less work than a bug.  I encourage you to work on
a patch.  

Don't forget that a patch, must do many things:  1) fix the
code, 2) fix (or add!) tests, 3) fix the documentation with
an appropriate \versionchanged (or \versionadded) tag, and
finally 4) update Misc/NEWS.

The old behaviour should generally be backwards compatible
by default when adding new functionality.  If it's a bug, it
may still be desirable to maintain backwards compatibility.
 I don't know enough about HTTP to provide any guidance here.