In the automatic error response, there are three fields currently:

• detail: It will be filled when a validation error happened.
• message: The HTTP reason phrase.
• status_code: The HTTP status code.

The status_code seems unnecessary since the HTTP header already contains the status info, and some users may want it in the camel case (it can be achieved with the custom error processor though), so maybe we should just remove it. Users who need it can easily add it back via the custom error processor:

@app.error_processor
def handle_error(error):
    return {
        ...
        'status_code': error.status_code
    }