我有一条路由,可以根据POST
请求将响应返回给用户。我应要求返回dict
。问题是在某些情况下,返回dict可以正常工作,但有时会引发错误。
任何人都可以解释理想的返回类型是什么,为什么在某些情况下dict
返回成功?
@app.route('/getuser', methods = ['post'] )
def getusername():
user = request.json.get("user_name")
# This works good for few cases
return {"username": user}
# Whereas other require this
return jsonify({"username": user})
答案 0 :(得分:1)
TLDR :没有区别。
基本示例:
from flask import Flask, request, jsonify
app = Flask(__name__)
@app.route('/getuser_dict', methods=['POST'])
def getuser_dict():
user = request.json.get("user_name")
return {"username": user}
@app.route('/getuser_jsonify', methods=['POST'])
def getuser_jsonify():
user = request.json.get("user_name")
return jsonify({"username": user})
if __name__ == '__main__':
app.run()
对/getuser_dict
和/getuser_jsonify
的请求和响应相同(无关部分):
> POST /getuser_dict HTTP/1.1
> Host: 127.0.0.1:5000
> User-Agent: insomnia/7.0.3
> Content-Type: application/json
> Accept: */*
> Content-Length: 24
| {
| "user_name": "John"
| }
* upload completely sent off: 24 out of 24 bytes
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Content-Type: application/json
< Content-Length: 20
< Server: Werkzeug/0.16.0 Python/3.6.8
< Date: Wed, 06 Nov 2019 09:34:51 GMT
* Received 20 B chunk
* Closing connection 65
内部返回dict
仅检查您返回的对象类型是string
,tuple
,BaseResponse
还是dict
。当它确定您确实通过dict
返回isinstance(rv, dict)
时,它将在您的jsonify(rv)
对象上调用dict
并返回。
请查看app.py
的{{3}}方法。 make_response所在的部分也在那里。