The Vary HTTP header
Recently, I stumbled upon the list of all registered HTTP Headers. This post is dedicated to the Vary HTTP Header.
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https://dev.to/nfrankel/the-vary-http-header-2m5m
@thepracticaldev Another important use for Vary, at least back in the day when used to speed up ordinary browser requests, was "Vary: Accept-Language" to vote serving the wrong language to users.