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Configuring Apache and Tomcat to serve my java web application through port 80

Default Tomcat installations run on port 8080 so you get urls like:
Some firewalls block port 8080 so I wanted my site to be available on port 80 so that it uses urls like:
One option was to modify the Tomcat configuration to listen on port 80. However, I already have Apache installed and listening on port [...]