The X-Forwarded-For rewrite rule alone is not enough: waitress 2+
strips forwarded headers from untrusted proxies by default, so the app
still saw 127.0.0.1 with the rule active. Trust the loopback proxy and
consume x-forwarded-for on the waitress command line; waitress then
rewrites remote_addr to the real client. Runbook gains the
allowedServerVariables unlock (500.52) and both troubleshooting rows.
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