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nginx - What should a proxy pass in the Host header?

Today I found out that $host and $http_host differ. At least $host doesn't contain the port number. Although there's more to it. My understanding is that people usually do proxy_set_header Host $host, which is... wrong? Is there some sort of general guideline?

question from:https://stackoverflow.com/questions/65900989/what-should-a-proxy-pass-in-the-host-header

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nginx-proxy has proxy_set_header Host $http_host in its config. Sounds like an authoritative source to me.


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