regex - htaccess force https and redirect www to non-www, but no other subdomains

Question

I know there are many similar threads, but none of them seems to match my exact problem. Here is what I’m trying to do:

(1) http://www.mydomain.com/ -> https://mydomain.com/
(2) http://mydomain.com/     -> https://mydomain.com/
(3) https://www.mydomain.com -> https://mydomain.com/

Ideally, I would also like to cover the situation if I will ever add more subdomains, to automatically behave like the following (preferably in a generic way that will work for any subdomain I add).

(4) http://sub.mydomain.com/ -> https://sub.mydomain.com/

At this point I’m wondering if it is even possible to create a single .htaccess file that does everything I need, although I have to admit that I understand regexes, but I’m not exactly a mod_rewrite uberpro.

Here are the solutions that I already tried:

• Force non-www and https via htaccess
  • Sort of works, but seems to generate a redirect loop
• .htaccess redirect www to non-www with SSL/HTTPS
  • Works for (1) and (3), but not for (2)
• htaccess force www to non-www with consideration of http or https
  • Redirects to http://mydomain.com/ (without https) for (1)
  • Does nothing for (2)
  • Redirects to http://mydomain.com/ (without https) for (3)

My SSL certificate covers the www-subdomain, so I’m not looking for a 'untrusted connection' error solution, I’m aware that isn’t possible.

Answer 1

I found most of the suggestions were not catching when you had something that was https://www.example.com and redirecting to https://example.com.

The following worked for all permutations:

RewriteEngine On

# match any URL with www and rewrite it to https without the www
RewriteCond %{HTTP_HOST} ^(www.)(.*) [NC]
RewriteRule (.*) https://%2%{REQUEST_URI} [L,R=301]

# match urls that are non https (without the www)
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} !^(www.)(.*) [NC]
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Hope this helps someone!