title: Current web socket session in ktor
body: <p>How can i get current web socket session?
  I had an idea to do something like this:</p>
  <pre><code>webSocket(&quot;/echo&quot;) {
              println(&quot;WebSocket connection&quot;)
  
              val thisConnection = Connection(this)
              val session = call.sessions.get&lt;ConnectionToUser&gt;()
  
              if (session == null) {
                  close(CloseReason(CloseReason.Codes.NORMAL, &quot;User not authorized&quot;))
              } else {
                  call.sessions.set(session.copy(connectionId = thisConnection.id, userId = session.userId))
              }
              //Some code
  }
  </code></pre>
  <p>But i cant set sessions in webSocket.</p>