UI Extensions SDK 404'ing

Hey guys,

I dove into UI Extensions yesterday and everything was working fine.
This morning, I’m getting 404s for the extension script.

I tried to load a contentful example extension via the web app to see if it was just me, and those aren’t loading either.

Going one step further, I made a super simple pen with only the script referenced in the github readme to replicate, and the 404 is still appearing in the console:

Anyone else able to replicate or have any solutions?

Try updating your script to point at


Ran into this same issue. Seems to be an issue with unpkg’s URL redirections.

1 Like

Cool, that worked for me too. Thanks for the tip :+1: