Which product are you using?
PDF.js Express Viewer
PDF.js Express Version
8.7.5
Detailed description of issue
My app is in dotNet 9 (Blazor) and I’m using the stadalone library installed manually with PDFJSExpress-view-only.zip
Can’t validate licence key, because in (https://auth.pdfjs.express/?key=) request header Origin is not set.
Same also when running in local environment is not picking as localhost.