[issue3243] Support iterable bodies in httplib

[Xuanji Li]

Xuanji Li <xuanji at gmail.com> added the comment:

Also, I am not familiar with the backward-comparability requirements of py3k, but orsenthil's patch will break py3k code that relies on data being a string, shouldn't this be mentioned somewhere?

Finally, I do not understand why my proposed change, which is to add

+    if not data:
+        request.add_unredirected_header('Content-length', '0')


so that code that relies on being able to pass a blank string as data (for instance, the code in test_urllib2.py) is still able to do so.

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