hosting multiple websites on apache under one ip address - apache

Question

I am trying to host multiple websites (app.diff1.com and app.diff2.com running on tomcat server) on my apache server which are running on ports 8082 and 8083 respectively, to access them i want to use a single domain name (app.in.xxx.com/diff) along with a differentiater (diff1/diff2).I used url rewriting to change the domain names respectively. Now when i am trying to access the websites i always end up with hitting the first virtual host.
Please suggest me if i am not approaching the solution correctly.
Code snippet:
in httpd.conf file.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_HOST} ^app\.in\.xxx\.com/([a-z]*)$
RewriteRule ^ http://www.app.%1.com [L,R=301]
</IfModule>
<IfModule mod_proxy.c>
ProxyRequests off
</IfModule>
NameVirtualHost *:80
<VirtualHost *:80>
ServerName www.app.diff1.com
ProxyPass / http://www.app.diff1.com:8082/
ProxyPassReverse / http://www.app.diff1.com:8082/
</VirtualHost>
<VirtualHost *:80>
ServerName www.app.diff2.com
ProxyPass / http://www.app.diff2.com:8083/
ProxyPassReverse / http://www.app.diff2.com:8083/
</VirtualHost>

Answer 1

Move your rewrites into the first listed virtual host, and stop trying to capture the first path component of the URL as if it were part of HTTP_HOST -- capture it in the RewriteRule itself and use $1.
Also see ServerPath which is an esoteric way to do the same mapping.