title: How to set Etag for a url in play framework?
body: <p>I have already searched to set Etag in playframework. All I got are<br>
  1) <a href="https://www.playframework.com/documentation/2.0/Assets" rel="nofollow">https://www.playframework.com/documentation/2.0/Assets</a><br>
  2) <a href="https://www.playframework.com/documentation/2.0/JavaResponse" rel="nofollow">https://www.playframework.com/documentation/2.0/JavaResponse</a><br></p>
  
  <p>First option only works for Asset or files.
  Second option does not work. I just added the three given in the example.</p>