Dynamic virtual hosts on Apache

This virtual host configuration will automatically choose a directory for the site's document root based on the domain name.

1. Set up a virtual host:
   /etc/httpd/conf.d/dynamic.conf

   <VirtualHost _default_:80>
     RewriteEngine on
   
     # Remove "www." from domain names by redirecting.
     RewriteCond %{HTTP_HOST} ^www\.
     RewriteRule ^(.*) %{HTTP_HOST}`$1  [C]
     RewriteRule ^www\.([^\_]*)\`(.*)$ http://$1$2 [R=301,L]
   
     # Use components of the domain to determine the document root.
     # %0 is the whole domain.
     # %1 is the first part (using dotted delimiters).
     # %-2 is the second to last part.
     ServerAlias *.example.com
     UseCanonicalName Off
     VirtualDocumentRoot /var/www/html/workspace/%1/htdocs
   </VirtualHost>
   

2. Add this to the .htaccess file configuring the application:
   /var/www/html/workspace/YOUR-APPLICATION/htdocs/.htaccess

   [...]
   RewriteBase /