Joomla behing apache httpd reverse proxy

We did a lot of research to get Joomla! CMS to work behind an Apache httpd reverse proxy.  It looks like Joomla! needs to know how you called the site in your browser's address bar, so this directive must be used:

ProxyPreserveHost On

There might be othe tweaks that I can't think of that were necessary, but I do remember that this one gave us a lot of headaches.

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