Apache ProxyPass only for subdomain and folder - apache

Question

I want to use ProxyPass and only apply for the following subdomain and folder:
de.domain.com/blog/ -> http://blog.olddomain.com/de/
Our new page will have multiple subdomains (each per locale). When i only use this:
ProxyPass /blog/ http://blog.olddomain.com/de/
ProxyPassReverse /blog/ http://blog.olddomain.com/de/
All subdomains are using the rule. So my question is, how can i tell ProxyPass only apply this on de.domain.com/blog/ and not on en.domain.com/blog/ etc.
Thank you!

Answer 1

The first option would be to split the VirtualHost configuration, and first have separate virtual host for de.domain.com which will include the above ProxyPass directives, and then have another virtual host for *.domain.com, without ProxyPass:
<VirtualHost *:443>
ServerName de.example.com
ProxyPass /blog/ http://blog.olddomain.com/de/
ProxyPassReverse /blog/ http://blog.olddomain.com/de/
# Other directives here
</VirtualHost>
<VirtualHost *:443>
ServerName *.example.com
# Other directives here
</VirtualHost>
If you don't want to do that (for example because it might make configuration maintenance more complicated) you can try:
RewriteEngine On
RewriteCond %{HTTP_HOST} =de.example.com [NC]
RewriteRule /blog/(.*) http://blog.olddomain.com/de/$1 [NC,P,L]
ProxyPassReverse /blog/ http://blog.olddomain.com/de/