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You must be clear which kind of proxy are you referring to, is it a web-proxy
To control traffic and requests to Servers hosting applications
Tomcat is a web server (can handle HTTP requests/responses) and web container (impiments java servelet API. also called servelet container) in one. Some may called it an application servers but its definitly not an fullfledged java EE application server(It des not impliment the whole java EE API)
