.htaccess URL redirect for sub domain

Question

How can I redirect all queries from sub folder to sub domain with .htaccess?

Including query string (after "/?").

And this should be friendly for SEO (generates 301).

Example:

https://example.com/app/?r=dl/catalog/show&param=1 

redirect to

https://sub.example.com/app/?r=dl/catalog/show&param=1 

Thank you!

Answer 1

Inside app/.htaccess you can use this rule:

RewriteEngine On

# works on Apache 2.4+ 
RewriteCond %{HTTP_HOST} ^(?:www\.)?(example\.com)$ [NC]
RewriteRule ^ %{REQUEST_SCHEME}://sub.%1%{REQUEST_URI} [L,R=301,NE]

If you're using older Apache 2.2 then use this rule instead:

RewriteCond %{HTTP_HOST} ^(?:www\.)?example\.com$ [NC]
RewriteCond %{HTTPS}s on(s)|
RewriteRule ^ http%1://sub.example.com%{REQUEST_URI} [L,R=301,NE]

References:

• Apache mod_rewrite Introduction
• Apache mod_rewrite Technical Details