redirect my site from www.foo.bar to cdn.foo.bar

is it possible to have an htaccess rule that will redirect my fil开发者_StackOverflow中文版es from

http://www.mydomain.com/page.html to http://cdn.mydomain.com/page.html but still making the link look like http://www.mydomain.com/page.html

I know masking urls isn't possible, but since they are on the same domain i was wondering if that was possible

Try these rules in your .htaccess file:

Options +FollowSymlinks -MultiViews
RewriteEngine on

# for http
RewriteCond %{HTTP_HOST} ^www.mydomain.com$ [NC]
RewriteCond %{SERVER_PORT} =80
RewriteRule ^(.*)$ http://cdn.mydomain.com/$1 [L,R]

# for https
RewriteCond %{HTTP_HOST} ^www.mydomain.com$ [NC]
RewriteCond %{SERVER_PORT} =443
RewriteRule ^(.*)$ https://cdn.mydomain.com/$1 [L,R]

However one caveat that it is an external redirect hence URL in your browser will change to http://cdn.mydomain.com/foo because when you are jumping from one host to another you cannot have internal redirect hence R flag is needed.

No idea about .htaccess but you could use a curl script in PHP.