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The HTTP Invoker allows for some of the properties to be passed as request headers from client caller. The following are possible http headers and what they mean: sessionId - is the remoting session id to identify the client caller. If this is not passed, the HTTP server invoker will try to create a session id based on information that is passed. Note, this means if the sessionId is not passed as part of the header, there is no guarantee that the sessionId supplied to the invocation handler will always indicate the request from the same client. subsystem - the subsystem to call upon (which invoker handler to call upon). If there is more than one handler per Connector, this will need to be set (otherwise will just use the only one available). These request headers are set automatically when using a remoting client, but if using another client to send request to the HTTP server invoker, may want to add these headers.