title: How to identify if a request type is synchronous or asynchronous
body: <p>Actually,  my requirement is, client can call my rest based services in both synchronous (request-response) or in asynchronous (request-acknowledgment-response) mode. Now, based on the request type, I have to follow the mode.</p>
  
  <p>Now, my question is, is there any way, from the request itself, by default, is there any indicator, which will tells the clients desire request-response model. 
  Service protocol is http. </p>
  
  <p>if not possible, then what will be the best practice, to handle this type of scenario.</p>