[issue3243] Support iterable bodies in httplib

[Senthil Kumaran]

Senthil Kumaran <orsenthil at gmail.com> added the comment:

Xuanji, a wording which does convey the approximate meaning is fine. I think, the Exception error messages will help the people based on the Context.

- Lets have the ValueError raised from the urllib/request.py. Changing it to isinstance(data,collections.Iterable) as Antoine suggested is okay here too.
- Same change for http.client code checking for an Iterable as specified in msg122905

tests are fine. Docs and NEWS should be updated.

Georg: Is it okay, if we push this feature in before Dec 4th, beta1 release?

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nosy: +georg.brandl

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