I need to redirect all requests from http://example.com/app to http://app.example.com/. In VirtualHost I can only specify a ServerName as example.com. I only want requests from the host plus a specific path to be redirected to the domain with subdomain.
<VirtualHost *:80> ServerName example.com/app ProxyPreserveHost Off ProxyPass / http://app.example.com/ ProxyPassReverse / http://app.example.com/ </VirtualHost> If I understand correctly what you're trying to do, this should do it:
<VirtualHost *:80> ServerName example.com ProxyPreserveHost Off ProxyPass /app/ http://app.example.com/ ProxyPassReverse /app/ http://app.example.com/ RedirectMatch ^/app$ /app/ </VirtualHost>
Since you probably already have a virtualhost for example.com, you should add the Proxy* lines to the existing config.
Ended up using apaches rewrite. Because I am using apache to forward requests to a tomcat application I do not have an .htaccess file which is where most tutorials tell you to place the rewrite. Turns out you can include it right in the virtualhost tag which is what I did. Here is a working sample.
<VirtualHost *:80> ServerName example.com/app ProxyPreserveHost Off ProxyPass / http://app.example.com:8080/AppName/ ProxyPassReverse / http://app.example.com:8080/AppName/ # Rewrite all request from example.com/app to app.example.com RewriteEngine On RewriteCond %{HTTP_HOST} ^example\.com$ [NC] RewriteRule ^/app/?(.*) http://app.example.com/$1 [R,L] </VirtualHost>