# Storing staticfiles on a separate subdomain
**URL:** https://pdfjs.community/t/storing-staticfiles-on-a-separate-subdomain/828
**Category:** Technical Support
**Created:** [June 18, 2021, 4:52am UTC](https://pdfjs.community/t/storing-staticfiles-on-a-separate-subdomain/828 "2021-06-18T04:52:28Z")
**Posts on this page:** 1
**Showing post:** 1
**PDF.js Express Version**
```javascript
|Core version|"7.3.3"|
|Build|"Ni80LzIwMjF8OThhMTM2NjE0"|
|WebViewer Server|false|
|Full API|false|
```
**Detailed description of issue**
My static files are hosted on a different subdomain. The iframe src/dest is on the same domain, it’s just the JS files that are on a separate subdomain.
I’m getting the following error:
```javascript
Uncaught (in promise) Error: Setting up fake worker failed: "Cannot read property 'WorkerMessageHandler' of undefined".
at PDFJSDocumentType.js:960
```
So the browser is obviously blocking inter-subdomain communication somewhere and returning undefined.
I’ve seen a similar error with PDF.JS when I was setting that up independently once, I needed something like:
```javascript
PDFJS.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/1.10.100/pdf.worker.min.js';
```
I’ve found other similar github issues where they recommend something like:
```javascript
pdfjs.GlobalWorkerOptions.workerSrc = `https://cdnjs.cloudflare.com/ajax/libs/pdf.js/${pdfjs.version}/pdf.worker.js`;
```
How do I access the underlying PDF.js from pdfexpress?
Any ideas?
**Expected behaviour**
N/A
**Does your issue happen with every document, or just one?**
All documents.
**Link to document**
N/A
**Code snippet**
```javascript
WebViewer UI
```
---
_[View the full topic](https://pdfjs.community/t/storing-staticfiles-on-a-separate-subdomain/828)._