title: How to change websocket url in graphql-playground (subscriptions)
body: <p>I wanted to change the graphql websocket end point inside graphql, anyone know how to do this?</p>
  
  <p>by default it pings </p>
  
  <pre><code>wss://localhost/graphql
  </code></pre>
  
  <p>I need to change it to pusher url</p>
  
  <p>thanks :-)</p>