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socket.onmessage = function(event) {
     if (event.data instanceof Blob) {
       // 1. Get the raw data.
   var blob = event.data;
       // 2. Create a new URL for the blob object.
       window.URL = window.URL || window.webkitURL;
       var source = window.URL.createObjectURL(blob);
       // 3. Create an image tag programmatically.
       var image = document.createElement("img");
       image.src = source;
       image.alt = "Image generated from blob";
 // 4. Insert the new image at the end of the document.
    document.body.appendChild(image);
  }