Cross origin request (COR) with embedded jetty - jetty

Question

I have a KML Server that outputs KML data and that I can configure as network place in Google Earth. The KML Server uses embedded Jetty.
I would like to also run the KML Server under Cecium, but then I need to configure Jetty to allow COR. Cesium runs from a webbowser.
There are many example w.r.t. Jettty/COR, but many of them do not run, are outdated, and are just unclear.
The KML Server main program is:
/*
** Create HHTP server
*/
final Server server = new Server(config.getKmlPortNumber());
// Set a handler for each context
ContextHandlerCollection contexts = new ContextHandlerCollection();
Handler[] contextHandler = new Handler[ForceIdentifier.TOTAL_IDENTIFIERS + 1];
final ContextHandler context = new ContextHandler("/");
context.setContextPath("/");
context.setHandler(new DefaultHandler(env));
contextHandler[0] = context;
// Set a handler for each Force Identifier.
for (byte i = 0; i < ForceIdentifier.TOTAL_IDENTIFIERS; i++) {
ContextHandler contexti = new ContextHandler("/" + i);
contexti.setHandler(new DefaultHandler(env, new ForceIdentifier(i)));
contextHandler[i + 1] = contexti;
}
contexts.setHandlers(contextHandler);
server.setHandler(contexts);
// Start the server and set some options
server.start();
//server.dumpStdErr();
server.setStopTimeout(1000);
server.setStopAtShutdown(true);
/*
** Start the federate
*/
try {
federate.start();
} catch (RTIexception ex) {
Main.logger.log(Level.SEVERE, null, ex);
}
/*
** Stop the federate
*/
federate.stop();
The KML Server uses serveral context handlers.
What needs to be done to enable COR here?
(Jetty version is: jetty-all-9.2.10.v20150310)

Answer 1

org.eclipse.jetty.servlets.CrossOriginFilter the technique that Jetty has for enabling COR related features, is only available under a ServletContext, meaning your example code, which doesn't use Servlets, or a ServletContext cannot utilize this filter.
You can, however, make your own Handler to do the COR related work for your servlet-free environment. (Consider looking at the cougar project, and its CrossOriginHandler implementation for inspiration)
Or you can switch to using a ServletContextHandler instead of a ContextHandler and then gain the benefit of using Jetty CrossOriginFilter in your project.