HandlerError with body data

[rp-]

Maybe this should be done different, but I would assume that I can additionally to modify the status_code of the HandlerError also add body data.
My use-case would be e.g.: parsing JSON data from the request and if there is a syntax error return the error message from serde(as body) with an UNPROCESSABLE_ENTITY status code.

[msrd0]

It is not possible to attach any data except for the status code to a HandlerError. I don't believe that a HandlerError should be upgraded to full response creation abilities (this was suggested before, e.g. in #529). However, it might make sense to include the error message (since every Error implements Display anyways) in the created error response. It sounds like that would cover your use case.

[rp-]

Thanks, reading through #529 gave me a better picture on the design choice of gotham here.
I guess I have to create a more flexible way for error returns anyway, so I'll probably not use HandlerError for that, it would be just nice to use ? in most situations without wrapping the error in a normal response.