[issue3243] Support iterable bodies in httplib

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> pitrou: actually that seems a bit suspect now... you need to handle
> 'data' differently depending on its type,

Yes, but you can't know all appropriate types in advance, so it's better
to try and catch the TypeError.

I don't understand your changes in Lib/urllib/request.py. len(data) will
raise anyway.

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