Internet TCP port 8009 is primarily used by Apache JServ Protocol version 1.3 (AJP13), a binary protocol that can proxy inbound requests from a web server through to an application server. Apache Tomcat, a popular open-source Java Servlet container, is an example of software that uses this port. This port is also used by the Apache JServ Protocol to allow for efficient, robust communication between the web server and the application server.
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