Python FlaskRestful POST 不采用 JSON 参数

我对Flask(&amp；Flask-RESTful)非常陌生.

My problem : json arguments for a POST is getting set to NONE (not working).

I am able to take arguments from the form-data, using POSTMAN plugin for chrome. But, when i switch to raw (& feed a json), it fails to read the json & assigns a NONE to all my arguments.

我读过一些与此相关的堆栈溢出帖子:link1,link2,link3.这些都没有帮到我.

我在Oracle Linux 6.5上使用python-2.6、Flask-Restful-0.3.3、Flask-0.10.1、Chrome、POSTMAN.

Python code app.py :

from flask import Flask, jsonify
from flask_restful import reqparse, abort, Api, Resource

app = Flask(__name__)
api = Api(app)

parser = reqparse.RequestParser()
parser.add_argument('username', type=str)
parser.add_argument('password', type=str)

class HelloWorld(Resource):
    def post(self):
        args = parser.parse_args()
        un = str(args['username'])
        pw = str(args['password'])
        return jsonify(u=un, p=pw)

api.add_resource(HelloWorld, '/testing')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5444 ,debug=True)

Testing this使用POSTMAN:

• Using form-data : works perfectly !
• Using raw -> json : causes this issue

Things tried #1:

Add json parameter to my add_argument() method in app.py

parser = reqparse.RequestParser()
parser.add_argument('username', type=str, location='json') # added json
parser.add_argument('password', type=str, location='json') # added json

Input:{"username":"hello"，"password":"world"}

Output:{p:"无"，"u:"无"}

Things tried #2 :

Change type to unicode in add_argument() method in app.py

parser = reqparse.RequestParser()
parser.add_argument('username', type=unicode, location='json') # change type to unicode
parser.add_argument('password', type=unicode, location='json') # change type to unicode

Input:{"username":"hello"，"password":"world"}

Output:{p:"无"，"u:"无"}

PS : I will keep updating my question, with every failed attempt. Please let me know if you need any more info to make this question more clear.