Return a Custom response in flask restful API

Custom response in Flask

from flask import Response, jsonify
import json
from flask_restful import Resource

class Api(Resource):

    def post(self):
        response = Response(
            response=json.dumps(dict(error='err')), 
            status=400, mimetype='application/json')
        return response
        
    # alternative
    def get(self):
        response = jsonify(dict(error='err'))
        response.status_code = 400
        return response

Very helpful (y)