How to support HTTP_AUTHORIZATION in PHP and Apache.
In the httpd-vhosts.conf and <VirtualHost *:port>...</VirtualHost>, add this content:
```
<IfModule mod_rewrite.c>
    Options +FollowSymlinks -Multiviews
    RewriteEngine on
    RewriteCond %{HTTP:Authorization} ^(.*)
    RewriteRule ^(.*) - [E=HTTP_AUTHORIZATION:%1]
</IfModule>
```