Why is my Composer Power-up returning a CORS error?
Question
Why would a Composer Power-up return a CORS error?
Answer
This is usually because the Power-up is calling a PageBuilder content source directly, instead of an API endpoint like Content API, Site Service API, etc. Power-ups are iFrames, and you will get a CORS error if you call the content source directly.
Update your Power-up to call an API endpoint to resolve this issue.