htaccess: subdomain to folder on server. Keep URL

Question

I need help with (internal redirecting?) using apache's htaccess.

On my server i have a main domain:

url: domain.com
server-path: /opt/public_html/domain.com/

and a subdomain:

url: sub.domain.com
server-path: /opt/public_html/sub.domain.com/

When a visitor types sub.domain.com i want the URL to be unchanged. I also want the server to serve the file /opt/public_html/domain.com/index.php to the visitor. How do i do this in .htaccess?

Also, if the visitor types sub.domain.com/sofa/ the server should serve the file /opt/public_html/domain.com/sofa/index.php without changing the URL.

Got it? OK last example:

If visitor types sub.domain.com/?big=mac the server should show the file /opt/public_html/domain.com/?big=mac without changing the URL.

Any ideas how to do this?

Answer 1

If you enable RewriteEngine In your .htaccess, you should be able to create a condition and rule to handle serving the main domain's pages at the subdomain URL. Something like this:

RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_HOST} sub.domain.com$
RewriteCond %{REQUEST_URI} !^/sub.domain.com
RewriteRule .* domain.com/%1 [L] 

The RewriteCond line makes the rule apply to any page at sub.domain.com and should be served from public_html/sub.domain.com. It should (hopefully internally) change the URI to http://domain.com/whatever without changing it in the browser.

Check out this question and this one for similar information. If .htaccess is really not working for you, you could try a proxy, mod_rewrite, or creating symlinks.