Fixing Universal Viewer 4.x "Unknown content type" Error with Local Hosting
The Problem In a Nuxt 3 project, I was using Universal Viewer (UV) embedded via iframe to display IIIF manifest images. The iframe source pointed to the external https://universalviewer.io/uv.html, but at some point the viewer stopped rendering entirely. The browser console showed these errors: SES Removing unpermitted intrinsics UV.js:2 Unknown content type Investigation universalviewer.io Redirect The first finding was that universalviewer.io now redirects to universalviewer.dev: <meta http-equiv="refresh" content="0; url=https://universalviewer.dev/uv.html"> Testing the same manifest URL on universalviewer.dev/uv.html produced the identical “Unknown content type” error. The issue was reproducible on the official site itself. ...
