Sending the request message in a COMMAREA

When you use a COMMAREA, the maximum length of the request message with all the headers is 33,272 bytes. Each header in the request message has a field that indicates what data structure or application data format comes next in the request message.

The headers that should be included in the request message depend on the interface that the service requester is using to invoke the adapter service. You also need to provide additional headers if you want to invoke a CICS application using passthrough processing and the Link3270 bridge.