[issue3243] Support iterable bodies in httplib

[Antoine Pitrou]

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

> - Lets have the ValueError raised from the urllib/request.py. Changing
> it to isinstance(data,collections.Iterable) as Antoine suggested is
> okay here too.

Xuanji is right: it's not. We want bytes to be accepted, and it's an
iterable.

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