Why does Jenkins complain that my reverse proxy setup is broken?

Why does Jenkins complain that my reverse proxy setup is broken?

apache tomcat jenkins configuration reverse-proxy

jenkins

Prevent Jenkins access on port 8080

jenkins reverse-proxy

jenkins

Jenkins with reverse proxy to alternative port number

curl nginx jenkins reverse-proxy build-server

jenkins

Apache basic authentication issue with reverse proxy

apache authentication ubuntu jenkins reverse-proxy

jenkins

IIS reverse proxy for Jenkins with CSRF protection

iis jenkins reverse-proxy url-rewrite-module server-core

jenkins

Jenkins and Tomcat using Reverse-Proxy Auth plugin

tomcat plugins jenkins basic-authentication reverse-proxy

jenkins

Unable to access Jenkins remotely using IIS reverse proxy

iis jenkins reverse-proxy

jenkins

Jenkins / Apache Reverse Proxy Error

apache jenkins reverse-proxy

jenkins

Jenkins in Docker with custom path with nginx as a reverse proxy

docker nginx jenkins reverse-proxy

jenkins

Jenkins behind nginx without subdirectory

nginx url-rewriting jenkins reverse-proxy

jenkins

Jenkins behind nginx reverse proxy doesn't redirect in all situations

docker nginx jenkins reverse-proxy

jenkins