A client can send requests to a created XIMSS session so that all responses (including the response messages and synchronous data messages) are returned only in response to the "empty requests".
where sessionID is the session message urlID attribute.
The HTTP request body should contain one <XIMSS /> element, with zero, one, or more XIMSS protocol requests.
All generated response messages (one for each XIMSS request sent, in the same order), and all synchronous data messages generated with the submitted XIMSS requests are re-submitted to the XIMSS session as asynchronous messages. The Server returns an empty HTTP response.
Example (single connection, polling):
Example (2 connections, waiting):