Apache VirtualHost with reverse proxy
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.
Prerequisites
The instructions below are based on an Apache Linux server running cPanel/ Web Host Manager. The set-up requires the following Apache modules:
- mod_proxy
- mod_proxy_http
- od_include
- mod_headers
- mod_rewrite
- mod_sed
mod_sed is the only uncommon module, however it is only required if you are
using the OutputSed directives, if you don't plan on making any
modifications to the origin website you can skip it.
VirtualHost
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:
/etc/apache2/conf.d/userdata/ssl/2_4/$user/$domainname/$file.conf
Where $user is the Linux user account associated with the hosting package,
$domainname is your cPanel domain name and $file is the .conf filename.
/etc/apache2/conf.d/userdata/ssl/2_4/example/example.com/reverseproxy.conf
ProxyPass Directives
Inside reverseproxy.conf the Reverse proxy directives are added:
/subdirectorywhere the origin website will be displayed (could be root "/")https://origin-website.example.com/is the origin website
ProxyPreserveHost off
SSLProxyEngine on
SSLProxyVerify off
SSLProxyCheckPeerCN off
SSLProxyCheckPeerName off
SSLProxyCheckPeerExpire off
ProxyPass "/subdirectory" "https://origin-website.example.com/"
ProxyPassReverse "/subdirectory" "https://origin-website.example.com/"
## Stop any existing rewrites on subdirectory
RewriteRule ^(subdirectory)($|/) - [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.
- layout/head.inc.php will be appended to the
<head> - layout/header.inc.php will be added to the start of
<body>tag - layout/footer.inc.php will be added just before the
</body>tag
These files can be used to apply style/scripting on top of the code supplied by the proxy.
Rebuild and Restart Apache
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:
/usr/local/cpanel/scripts/rebuildhttpdconf
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:
/usr/local/cpanel/scripts/restartsrv_httpd
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