统一返回json数据，允许主动触发异常，拦截所有http异常转为json

autojsonresp.py

# coding:utf8

from flask import Flask, Response, jsonify
from werkzeug.exceptions import HTTPException


class JsonResponse(Response):

    @classmethod
    def force_type(cls, rv, environ=None):
        if isinstance(rv, dict):
            rv = jsonify(rv)
        return super(JsonResponse, cls).force_type(rv, environ)


class ApiError(Exception):

    def __init__(self, code, message, status_code=200):
        super(ApiError, self).__init__()
        self.code = code
        self.message = message
        self.status_code = status_code

    def to_dict(self):
        rv = dict(code=self.code, msg=self.message)
        return rv


app = Flask(__name__)
app.response_class = JsonResponse


@app.errorhandler(ApiError)
def handle_api_error(e):
    response = jsonify(e.to_dict())
    response.status_code = e.status_code
    return response


@app.errorhandler(HTTPException)
def handle_exception(e):
    response = jsonify({
        "code": e.code,
        "msg": e.name,
    })
    response.status_code = e.code
    return response


@app.route('/')
def index():
    return {
        'code': 0,
        'msg': None,
    }


@app.route('/err')
def err():
    raise ApiError(1000, "test error")


if __name__ == '__main__':
    app.run(debug=True)