.htaccess www to non-www while keeping path, ssl, and query string - apache

Question

I'm trying to achieve the following in .htaccess:
redirect www to non-www
keep the path that has been requested (e.g. domain.com/path/to/file.php)
keep the query string, if any (e.g. domain.com/path/to/file.php?key=val&key2=val2)
keep the protocol that has been requested (either http or https)
I tried this code:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^domain\.com$ [NC]
RewriteRule ^(.*)$ http://domain.com/$1 [R=301,L]
but it doesn't respect http/https, nor does it keep the path that has been requested (e.g. it redirects https://www.domain.com/path/file.php to http://domain.com/file.php, when it should redirect to https://domain.com/path/file.php instead.)
Any ideas?

Answer 1

You need to check if a request is http or https, and redirect to the correct protocol. Right now, you're redirecting everything to http://. You can use this condition and grouping:
RewriteCond %{HTTPS}:s (on:(s)|off:s)
This uses the %{HTTPS} variable, which is either "on" or "off", and pairs it with an s. Then we match either on:(s) or off:s. Therefore, if HTTPS is "on", the (s) gets grouped and we can backrefernce it using a %2, otherwise, if HTTPS is "off", nothing gets grouped and %2 is blank. We can then use it in your redirect:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^domain\.com$ [NC]
RewriteCond %{HTTPS}:s (on:(s)|off:s)
RewriteRule ^(.*)$ http%2://domain.com/$1 [R=301,L]
As for the second thing about the paths not being preserved, it sounds like your rules are in the directory /path, which means it gets stripped off when it gets sent through these rules. You need to move them to your document root. Alternatively, if you must have your rules in the /path directory, you can use the %{REQUEST_URI} variable instead:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^domain\.com$ [NC]
RewriteCond %{HTTPS}:s (on:(s)|off:s)
RewriteRule ^ http%2://domain.com%{REQUEST_URI} [R=301,L]