Create blob over https

Question

I'm attempting to move an existing application behind nginx for ssl termination and load balancing between two servers. The app works fine currently, but when behind ssl I get an error about a web worker I'm creating from a blob.

Edit to clarify Running the node server with ssl also causes this. I'm not loading it from an external resource, the page itself is creating it via a script that was also fetched over https.

Mixed Content: The page at 'https://example.com' was loaded over HTTPS, but requested an insecure Worker script 'blob:null/7dc18b31-c49c-48c5-b76f-443a1a9b459f'. This request has been blocked; the content must be served over HTTPS.

The worker is created at the page that was loaded over https, here is the creation code.

var blobUrl;
try {
  blobUrl = new Blob([blobCode], {type: 'application/javascript'});
} catch (e) {
  window.BlobBuilder = window.BlobBuilder
    || window.WebKitBlobBuilder
    || window.MozBlobBuilder;
  blobUrl = new BlobBuilder();
  blobUrl.append(blobCode);
  blobUrl = blobUrl.getBlob();
}

var worker = new Worker(URL.createObjectURL(blobUrl));

Is there a way to create a web worker from a blob and get it to load over https?