Use RFC-9457 for errors

[jarle]

There is a proposed standard for error responses: https://www.rfc-editor.org/rfc/rfc9457.html
This is supported in other established frameworks such as Spring Boot.

It uses the application/problem+json content header for error responses. Maybe this could be built into the framework?

[thetutlage]

Yeah, looks good.

Do you mean the existing errors thrown/converted by the packages can format them as per the define spec or are you also expecting some userland abstractions to make it easy to define these sort of errors?