title: Call back rest url using spring framework
body: <p>I writing rest web services using spring framework 4.0 jars.
  All the get calls and post are working fine. </p>
  
  <p>I wanted to know how to implement an api which works asynchronously.
  The client should post to this url and wait for the response ; something like call back mechanism between server and client . Server when gets the data posts response to this url.</p>
  
  <p>Thanks in advance</p>