Block access to specific URL

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http://unix.stackexchange.com – I have java war applications hosted in a glassfish, some of then exposing web services. I need a way to block access to an specific application without blocking the entire access to server by firewall, that is, blocking access to http://server.com:8080/app1/start?somestuffs, for instance. This is beyond the use of a firewall. Is there a solution without the need of using a proxy server? (HowTos)