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I want a set-up where an Amazon load balancer forwards requests received on any of port 21001, 21002 and 21003 and send them all to an NGINX reverse-proxy on port 443 (regardless) which in turn forwards the request to a member of a cluster by IP address. Is there a directive I can include in an nginx.conf to determine the port that the original request was sent to in order to route this? X-Forwarded-Proto seems close, but only determines between https and http, not arbitrary high TCP ports.

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