Custom http error handler

[giomf]

Motivations

Currently an error thrown by a http handler gets transformed into a 500 Internal server error

• Would you like to implement this feature? [y/n]
  With some help I could try it, yes.

Solution

It would increase the qualtiy of error handling if its possible to map specific internal errors to error codes.
By giving the possibility to register a custom error handler that maps errors like parsing errors of a json object to an 400 Bad request for example.

Alternatives

Additional context

Maybe this can help?
Also #11 goes in this direction.

[ivmarkov]

This feature can be implemented completely in Rust, in app code, so I don't see why we should be bringing even more unsafe ESP-IDF C code.

If you want to have a custom error reporting, just wrap your Rust HTTP handler(s) in a custom function that returns whatever you want to the client, when an error happens.

[giomf]

Yes you are right.

We dont have to use the IDF code. Using a wrapper for the handlers seems doable.
I just thought to have some better support by the framework would be nice, but maybe overthinking this here.

[ivmarkov]

If it becomes too unwieldy to do it all in Rust, ping here, and we might expose the C error handler. Though I'm not holding my breath with the C handler we'll save much. :)

[giomf]

Thanks. I will close for now. :)