For more information on using FastCGI under Apache, visit
L<http://www.fastcgi.com/mod_fastcgi/docs/mod_fastcgi.html>
+=head3 Authorization header with mod_fastcgi or mod_cgi
+
+By default, mod_fastcgi/mod_cgi do not pass along the Authorization header,
+so modules like C<Catalyst::Plugin::Authentication::Credential::HTTP> will
+not work. To enable pass-through of this header, add the following
+mod_rewrite directives:
+
+ RewriteCond %{HTTP:Authorization} ^(.+)
+ RewriteRule ^(.*)$ $1 [E=HTTP_AUTHORIZATION:%1,PT]
+
=head2 Lighttpd
These configurations were tested with Lighttpd 1.4.7.