According to Search Land and many other sources, if you are developing Dynamic Maintenance mobile content for your site, you must set the Vary: User-Agent HTTP header.
Is this done in a .htaccess file or somewhere else? This would be my first step, and I would really appreciate help and even an example. After searching, I narrowed it down to meta tags or htaccess, however, I could be wrong.
Your help is greatly appreciated. Thanks you
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