[Plugin: W3 Total Cache] Where does 'dont-vary' env get defined?

  • In W3TC section of my .htaccess I found this line:
    Header append Vary User-Agent env=!dont-vary
    I’ve googled that and found that it’ll add “User-Agent” to “Vary” header if environment “dont=vary” is not set. But I’ve noticed that static files (ex: jquery-migrate.js) don’t have this value. So, I wonder where does this environment get defined?

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