D3 Examples - uwsgi Websocket error: ASYNC call without async mode !!!, IOError: unable to fd to the event queue

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<!doctype html>
<meta charset=utf-8>
<title>UWSGI WS test</title>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular.min.js"></script>
<script>
  angular.module('app', []).controller('Ctrl', function ($scope) {
    this.logMessages = [];
​
    var self = this;
​
    var log = function (msg) {
      self.logMessages.push({date: new Date(), msg: msg});
      $scope.$digest();
    }
​
    var ws = new WebSocket('ws://localhost:5000/ws/');
    ws.onopen = function () {
      log('WS open');
      ws.send('message to server');
    }
    ws.onmessage = function (msg) {
      log('WS message received: ' + msg);
    };
    ws.onclose = function () {
      log('WS closed');
    };
    ws.onerror = function (err) {
      log('WS error: ' + err);
    }
  });
</script>
<body ng-app="app" ng-controller="Ctrl as ctrl" class="container">
  <h2>uWSGI websocket test</h2>
​
  <div ng-repeat="msg in ctrl.logMessages.slice().reverse()"><pre>[{{msg.date|date:'mediumTime'}}]: {{msg.msg}}</pre><div>
</body>
​
    