This post documents the process of setting up a reverse proxy to load one (Origin) website in the subdirectory of another. During this process the reverse proxy directives will also append HTML to the head and body of the origin website.
The instructions below are based on an Apache Linux server running cPanel/ Web Host Manager. The set-up requires the following Apache modules:
mod_sed is the only uncommon module, however it is only required if you are
OutputSed directives, if you don’t plan on making any
modifications to the origin website you can skip it.
The server will already be preconfigured to listen for additional .conf files for each domain once they’re added to the correct directories. For the standard WHM/cPanel/Apache combination:
$user is the Linux user account associated with the hosting package,
$domainname is your cPanel domain name and
$file is the .conf filename.
reverseproxy.conf the Reverse proxy directives are added:
/subdirectorywhere the origin website will be displayed (could be root “/”)
https://origin-website.example.com/is the origin website
ProxyPreserveHost off SSLProxyEngine on SSLProxyVerify off SSLProxyCheckPeerCN off SSLProxyCheckPeerName off SSLProxyCheckPeerExpire off ProxyPass "/subdirectory" "https://origin-website.example.com/" ProxyPassReverse "/subdirectory" "https://origin-website.example.com/" ## Stop any existing rewrites on subdirectory RewriteRule ^(subdirectory)($|/) - [L] <Location "/subdirectory"> <IfModule mod_headers.c> RequestHeader unset accept-encoding Header unset Content-Length </IfModule> # Add new layout fields Options +Includes AddOutputFilterByType Sed;INCLUDES text/html OutputSed "/<!--#[a-zA-z]/d" OutputSed "s/\\(<\/head>\\)/\\<!--#include virtual=\"\/layout\/head.inc.php\"--><\/head>/g" OutputSed "s/\\(<body[^>]*>\\)/\\<!--#include virtual=\"\/layout\/header.inc.php\"-->/g" OutputSed "s/\\(<\/body>\\)/\\<!--#include virtual=\"\/layout\/footer.inc.php\"--><\/body>/g" </Location>
The above code will automatically try to include additional files in the pages processed by ProxyPass.
These files can be used to apply style/scripting on top of the code supplied by the proxy.
Once the reverse proxy directives have been added to the Apache configuration, the live conf file needs to be rebuilt to include the new directives:
The rebuild process will flag any errors with the reverse proxy code. These can then be rectified before a successful rebuild.
Then the obligatory Apache restart: