How to run EventSource inside Shared Worker?

问题:

I implemented server-sent events to receive messages from the server. I describe how I implemented it on another question

Now I am trying to run it inside a shared worker to prevent the user from opening multiple connections to the servers via multiple browser tabs.

Here is what I have done to run the code inside a Shared Worker

created a file calles worker.js and I put this code inside of it

self.addEventListener('getMessagingQueue', function (event) {
    console.log('Listener is Available');
    var thisp = this;
    var eventSrc = new EventSource('poll.php');

    eventSrc.addEventListener('getMessagingQueue', function (event) {

    var message = JSON.parse(event.data);

    thisp.postMessage(message);

    }, false);

}, false);

Then when the HTML page loads I call this code

$(function(){       

        var worker  = new SharedWorker('worker.js');

        worker.addEventListener('getMessagingQueue', function (event) {
          var message = event.data;

          console.group('Message Received');
          console.log( message );
          console.groupEnd();

        }, false);

    });

But the code is not returning messages from the server.

How can I correctly run EventSource event inside the shared worker?