Integration with flask-restful & error handling

Similar to #86, errors like SignatureExpiry are returning 500 rather than 4xx errors.

However I am using flask-restful which does not have an error_handler, so the solutions in the referenced issue do not apply.

Flask-restful is briefly mentioned on the releases page here , but setting application.config['PROPAGATE_EXCEPTIONS'] = True didn’t have any effect for me.

Any insight into how I can correctly deal with error handling using flask-restful?

[cesarmarroquin]

I also encountered this issue. I could not replicate it at all in development, but was getting 500s instead of 401s in production and staging.

I was able to reproduce it by setting the debug setting to false in development mode, and the 500s showed up.

I was able to fix it by setting application.config['PROPAGATE_EXCEPTIONS'] = True

[alexander-ding]

@paurakhsharma

I think I found a workaround to integrate custom errors. Here’s my current setup: Set PROPAGATE_EXCEPTIONS = False Then overwrite the error handler flask_restful.Api object as such:

from flask import Blueprint
from flask_restful import Api as _Api

# some custom errors
class RoomDoesNotExist(Exception):
    pass

CUSTOM_ERRORS = {
'RoomDoesNotExist': {
        'message': "A room by that name does not exist.",
        'status': 404,
    },
}

class Api(_Api):
    def error_router(self, original_handler, e):
        """ Override original error_router to only custom errors and parsing error (from webargs)"""
        error_type = type(e).__name__.split(".")[-1] # extract the error class name as a string
        # if error can be handled by flask_restful's Api object, do so
        # otherwise, let Flask handle the error
        # the 'UnprocessableEntity' is included only because I'm also using webargs
        # feel free to omit it
        if self._has_fr_route() and error_type in list(CUSTOM_ERRORS) + ['UnprocessableEntity']:
            try:
                return self.handle_error(e)
            except Exception:
                pass  # Fall through to original handler

        return original_handler(e)

api_bp = Blueprint('api', __name__)
api = Api(api_bp, errors=CUSTOM_ERRORS)

This way, flask_restful’s errors are handled by flask_restful’s Api object, and other errors fall through to Flask’s error handler.