[issue18978] Allow urllib.request.Request subclasses to override method

[Jason R. Coombs]

Changes by Jason R. Coombs <jaraco at jaraco.com>:


Added file: http://bugs.python.org/file31678/061eb75339e2.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18978>
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