[issue3243] Support iterable bodies in httplib

[Xuanji Li]

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

Actually I don't think you can go around changing test_urllib2.py, they are after all regression tests... and surely some users will send "" as data.

My patch handles the case of 0-length data specially, removing the need for 2) Can call len but not buffer: assume len == #bytes

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