title: Shiny / Shiny-Server does not render outputs (plots, datatable)
body: <p>I'm having trouble with my shiny installation. I have Shiny Server (1.5.3.838) on Ubuntu 16.04.3 LTS with Shiny package version 1.0.3. Here is the screenshot;
  <a href="https://i.stack.imgur.com/qsTAX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qsTAX.png" alt="enter image description here"></a></p>
  
  <p>Shiny-server does not render the sample-app's plot. But i think the problem is not about the shiny-server because the same issue exists when i ran the application via Rstudio. </p>
  
  <p>Things i've tried so far;</p>
  
  <ul>
  <li>Change the shiny-server log level to TRACE</li>
  <li>Change the application log level</li>
  <li>Install different versions of Shiny-server (1.5.x, 1.4.x)</li>
  <li>Install different versions of Shiny package (1.0.x)</li>
  <li>Try on different browsers (Chrome, Firefox, IE)</li>
  <li>Change the shiny-server conf file into this;</li>
  </ul>
  
  <p>preserve_logs true;
  sanitize_errors off;
  disable_protocols xdr-streaming xhr-streaming iframe-eventsource iframe-htmlfile;</p>
  
  <p>Edit: My R version is Microsoft R Server 9.1.0 (on top of MRO 3.3.3)</p>