Suppose you are running a server/daemon as a normal user on a very high port number but you wish to serve the contents on an existing Apache web server. You can use Apache's mod_rewrite and mod_proxy modules to proxy any requests made to Apache to your internal service.

An example use-case would be, if you ran a rails application on a cPanel account listening on but you want to serve it on your primary domain.

If Apache has mod_rewrite, mod_proxy and mod_proxy_http support enabled, create a .htaccess file with the following contents:

# Prevent errors about /index.html not found
DirectoryIndex disabled

# Use [P] to enable proxy
RewriteEngine on
RewriteRule ^(.*)$$1 [P,L]

With this file made, any requests made to your website will now be proxied by Apache.

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