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Middleware for utilizing Web-server-provided authentication.
If request.user is not authenticated, then this middleware attempts to
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persist the user in the session.
The header used is configurable and defaults to ``REMOTE_USER``. Subclass
this class and change the ``header`` attribute if you need to use a
different header.
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Middleware for Web-server provided authentication on logon pages.
Like RemoteUserMiddleware but keeps the user authenticated even if
the header (``REMOTE_USER``) is not found in the request. Useful
for setups when the external authentication via ``REMOTE_USER``
is only expected to happen on some "logon" URL and the rest of
the application wants to use Django's authentication mechanism.
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