find out reason of “Updating failed” in Post-editor

Question

In some cases, if there is issue in code or whatever, and try to update the post in Gutenberg post-editor, you will get "Updating failed" error message:

Is there any way to debug/find out the reason (i.e. in console) what error happened there or what was the response from the erroneous page?

Answer 1

You could poke around in the Network tab. Filter the requests by XHR. You can view the headers and the Response from there.

I think I read somewhere that error reporting is something Gutenberg dev is planning on improving in the future.