title: What does 'request-response' mode in 'routing options' Oracle Service Bus action mean?
body: <p>I am using <code>Service Callout</code> to invoke external web services and when I add the action <code>routing options</code> the <code>mode</code> parameter accepts two values:</p>
  
  <ul>
  <li>request</li>
  <li>request-response</li>
  </ul>
  
  <p>But I don´t know which is the difference and the official documentation states nothing about these values <a href="http://docs.oracle.com/cd/E28280_01/admin.1111/e15867/proxy_actions.htm#OSBAG1123" rel="nofollow noreferrer">http://docs.oracle.com/cd/E28280_01/admin.1111/e15867/proxy_actions.htm#OSBAG1123</a></p>
  
  <p>Regards </p>