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I have done a lot of searching and have tried many things but I have still not managed to find a way of doing this exactly how I want it.

Without having to make an Apache VirtualHost for each subdomain, and either with apache2 (preferably), htaccess or DNS, I would like to redirect:

  • domain.xyz to domain.com
  • domain.xyz/* to domain.com/*
  • *.domain.xyz to *.domain.xyz (so a.domain.xyz goes to a.domain.com and b.domain.xyz goes to b.domain.com)
  • *domain.xyz/* to *.domain.com/*

What is the easiest way of doing this?

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Approach 1

Disclaimer: I have not tried this first approach , but I think it might work.

<VirtualHost *:80>
    RewriteEngine On
    RewriteCond %{HTTP_HOST} ^(.*)\.xyz$
    RewriteRule ^/(.*)$ http://%1.com/$1 [R=301,L]
</VirtualHost>

So, the first RewriteCond should match the HTTP_HOST which will basically be your domain if it ends in .xyz. If it does, you just rewrite the request to the .com TLD with the same URI.

Approach 2

There's also another way. You could simply forward any request to a static PHP file, and place the original URL as a parameter to the script and once called, replace the URL to the domain you want. That would imply the following changes:

  1. Edit your apache's configuration and put something like this inside. This has been copied from here.

    RewriteEngine on
    
    RewriteCond %{REQUEST_FILENAME} !index.php
    RewriteRule .* index.php?url=$0 [QSA,L]
    

    This way, any request will be forwarded to a index.php file located wherever you defined in your DocumentRoot directive.

  2. In that file, you'd do something like this:

    <?php
       $url =  "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
       $escaped_url = htmlspecialchars($url, ENT_QUOTES, 'UTF-8');
    
       preg_match("/^http:\/\/(.*)\.xyz(.*)$/", $escaped_url, $matches);
       header("Location: http://{$matches[1]}.com{$matches[2]}");
    ?>
    

    So you're just matching the original URL (stored inside $url) against a regexp and changing the location of the user (via the header()) function to the same domain but with different TLD. This last try has been tested and works well.

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