htaccess redirect for non-www both http and https

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Try this rule:

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

Here’s an explanation:

  1. The first condition tests if the HTTP header field Host has the required format (contains exactly one period).
  2. The second condition tests if the concatenated value of the value of the HTTPS variable (values on and off) and s (so either ons or offs) is equal to ons and captures the s. This means if %{HTTPS}s evaluates to ons, the first matching group is s and empty otherwise.
  3. The rule will match all requests as every string has a start (marked with ^) and redirects them to the evaluated value of http%1://www.%{HTTP_HOST}%{REQUEST_URI} if both conditions are true. Where %1 is the first matching group of the previous condition (s if HTTPS and empty otherwise), %{HTTP_HOST} is the HTTP Host of the request and %{REQUEST_URI} is the absolute URL path that was requested.

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