[issue12576] urlib.request fails to open some sites

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

ValueError('I/O operation on closed file') error comes from HTTPResponse.__enter__() which is implemented in IOBase:

    def __enter__(self):  # That's a forward reference
        self._checkClosed()
        return self

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12576>
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