Test using example "Respond with another side" but with video response results continuously "302 found" but without redirection

I have tested a use case. I query a URL (with fetch) with a video on it and send it as a response (TransformStream, pipeTo).

For whatever reason, when I call the URL (the worker) I get a “302 Found” response but no redirection URL. Actually an untypical case.

I have tried several times to find the problem. If I use another “new Response(“test”)” before sending my response. then I get the output “test”. But as soon as it goes to sending the video, then there is a NGINX like error page with 302 Found.

In an identical test yesterday everything ran fine. Nothing has changed in the code.