R. David Murray <rdmur...@bitdance.com> added the comment:

For backward compatibility this would have to be something more like:

    if not isinstance(default, list):
        if isinstance(default, string):
           default = [default]
        else:
           default = list(default)
    return ', '.join(self.headers_get_all(name, default))

Care to work up a patch, including unit test (it looks like the unit tests live 
in test_httplib)?

----------
components: +Library (Lib)
keywords: +easy
nosy: +r.david.murray
stage:  -> unit test needed
type: crash -> behavior

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8572>
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