[fix] Login: HTTP Auth when internal redirects occur (#1772)

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When Apache performs an internal redirect, it stores the username in the
REDIRECT_REMOTE_USER variable instead of REMOTE_USER, breaking HTTP
authentication. For more information, see this Stack Overflow
discussion:
<https://stackoverflow.com/questions/3050444/when-setting-environment-variables-in-apache-rewriterule-directives-what-causes>

This commit first tries REMOTE_USER, as before. If it is not set, it checks whether REDIRECT_REMOTE_USER is set.

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500 Internal Server Error

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