"rasa inspect" fails to load JavaScript due to wrong MIME type

Rasa Pro CALM
1

Rasa Pro CALM Developer Edition on Windows 10 with Python 3.9.13. When I run “rasa inspect” it starts local Rasa server (on http://0.0.0.0:5005) and opens a browser window at “http://localhost:5005/webhooks/inspector/inspect.html”; but the later fails to load JavaScript code because of wrong MIME type returned by the server for index_xyz.js.

Full error in the browser console:

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/plain". Strict MIME type checking is enforced for module scripts per HTML spec.

Is there any way to fix this?

2

Found the root cause of the problem - it was the following key in Windows Registry:

HKEY_CLASSES_ROOT\.js\Content Type

For some reason it was set to “plain/text” instead of “application/javascript”.

After changing the key value, rebooting the laptop, purging the “uv cache” and reinstalling the rasa-pro SDK - the problem is gone.

1 Like
3

Thank you! I was having the same problem and this worked.