.htaccess rewrite all contents from subdomain to domain - apache

Question

I rewrited a subdomain to a section on my site:
https://music.example.com points to https://example.com/section.php?url=music
RewriteCond %{HTTP_HOST} ^music.example.com
RewriteRule ^(.*)$ section.php?url=music/$1 [L,NC,QSA]
But I need to use the same images, css, etc. for this (and other) subdomains.
https://example.com/images/img.jpg
Should be accessible from https://music.example.com/images/img.jpg
I tried to find a solution but I might not be doing the right search.

Answer 1

RewriteCond %{HTTP_HOST} ^music.example.com
RewriteRule ^(.*)$ section.php?url=music/$1 [L,NC,QSA]
This rule internally rewrites (not "redirects") a request of the form music.example.com/<anything> to section.php?url=music/<anything>. ie. Everything, including all images and CSS etc. This is much more than stated in your description, in which you only want the root directory to "point to" https://example.com/section.php?url=music.
If you only want the root directory to be rewritten then restrict the regex ^(.*)$ to only match the root.
For example:
RewriteCond %{HTTP_HOST} ^music\.example\.com
RewriteRule ^$ section.php?url=music [QSA,L]
NB: Don't forget to backslash-escape the literal dots in the regex.
This now naturally excludes everything else from being rewritten, except for requests to the subdomain's root directory, ie. https://music.example.com/ only.
.htaccess redirect all contents from subdomain to domain
As noted above, this is an internal "rewrite", not an external "redirect". And neither does this rewrite from subdomain to domain. The requested hostname does not change and it is assumed that both the subdomain and domain apex point to the same place on the filesystem.