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WSGI applications that parse the URL and dispatch to on-disk resources
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WSGI middleware
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``urlparser_hook(environ)``
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application.
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If no file can be found (*in this directory*) to match the
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files.
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searched in any way.
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Create a URLParser application that looks in ``directory``, which
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directory (like ``'index'`` for ``'index.html'``).
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