Apache JServ Protocol
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Apache JServ is implemented as two separate components, one written in C and the other in Java. The C and Java sides communicate using a special protocol, called Apache JServ Protocol (AJP).
Apache JServ is a module for the popular Apache web server that implements Sun's Java Servlet API for running server-side Java code.
http://www.magiccookie.com/computers/apache-jserv/ http://tomcat.apache.org/tomcat-3.3-doc/AJPv13.html