Better error messages...

[thebjorn]

I just got this error:

SvelteKitError: POST method not allowed. No actions exist for this page

I was trying to post from /my/special/page to /logout?next=/goodbye, so it's not exactly clear what "this page" means in this context, especially if you're not experienced (e.g. does it mean a +..page.. file, a path/url, or a route..?).

What can be improved:

1. give me all the information the error handler has - or can gather (it's already an error so there shouldn't be any concerns about using cycles to gather input).
2. give me an error number (SvelteKitError[E042]: ...) that I can look up to find more information (or even make the error number a link to the docs?)

[eltigerchino]

I think this is a great idea. I've created an issue for this here #11876

[mig-hub]

I think it is a great idea as well. I am currently fighting the same issue and struggling to investigate because it does not tell me what it tries and what file/action could be missing.

[thebjorn]

You might want to comment on #11876 instead...