SSSP 2 and 3 requires Content-Type and Content-Length

The Error

Old SSSP 2 and 3 has limitation on the file system API and might not be able to download files using FileSystem API and Media Cache API.

Why it's happening

SSSP 2 and 3 require file headers - Content-Type and Content-Length - to be available on your server.

How to Resolve

1. Check that your server, CDN and storage (e.g. AWS S3) are sharing these headers.