How can I redirect all Subdomains to https-CodePudding

Hello what should add to htaccess to redirect all subdomains to https for example webmail.example.com?

<IfModule mod_rewrite.c>

  RewriteOptions inherit
  RewriteEngine On
  RewriteCond %{HTTPS} off
  RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
  RewriteBase /
  RewriteRule ^index\.html$ - [L]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_FILENAME} !-l
  RewriteRule . /index.html [L]

</IfModule>

Header set content-Security-Policy: upgrade-insecure-requests

CodePudding user response：

RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

You already have a rule that redirects everything (any domain/subdomain) to HTTPS. So if this is not working then either:

This subdomain is not pointing to the same area of the filesystem (so this .htaccess file does not apply and the directives are ignored).
These directives are not doing anything, ie. mod_rewrite or .htaccess overrides are not enabled on your server.

Since you have a "front-controller" pattern in the .htaccess file (the last rule), I assume this is being used successfully to serve your website? If so then .htaccess and mod_rewrite would appear to be enabled and working.

That would seem to leave #1. In which case is the webmail subdomain pointing to this area of the filesystem?

Is the webmail subdomain something that you've created or is this part of your hosting account? webmail is a common subdomain that cPanel uses (and you have tagged your question cPanel). In which case, this subdomain likely points to an entirely different area of the filesystem and is out of your control.