ProxyHeadersMiddleware not using the X-Forwarded-Port header

[fiannac]

Discussed in #1948

^{Originally posted by fiannac April 21, 2023}
From the documentation:
--proxy-headers / --no-proxy-headers Enable/Disable X-Forwarded-Proto, X-Forwarded-For, X-Forwarded-Port to populate remote address info.

But I've noticed that, when the flag is set, the X-Forwarded-Port is not actually used by the application, and the source port is always set to 0.
This has to do with how the `ProxyHeadersMiddleware' is implemented, which does not match the behavior described in the docs.

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[Kludex]

The discussion is already created.