如何從 flask 錯誤處理程序返回 json 響應？

Question

我有一個 Flask 應用程序，我在其中注冊了一個錯誤：

app.register_error_handler(401, handle_errors)

我的handle_errors function 看起來像這樣：

def handle_errors(error):
    response = make_response()
    response.data = str(error.to_dict())
    response.content_type = "application/json"
    response.status_code = 401
    return response, response.status_code

但是，當我調用 API 時，我的響應如下所示：

< HTTP/1.0 401 UNAUTHORIZED
< Content-Type: text/html; charset=utf-8
...

為什么即使我將content_type設置為application/json ，它仍將其作為text/html返回？

Answer 1

import json

from flask import Flask, Response, abort

app = Flask(__name__)
app.config['PROPAGATE_EXCEPTIONS'] = True

#register 500 error handler
@app.errorhandler(Exception)
# handle all other exception
def all_exception_handler(error):
    res = {"error": str(error)}
    return Response(status=500, mimetype="application/json", response=json.dumps(res))


# handle 401 exception
def error_401_handler(error):
    res = {"error": "Unauthorized"}
    return Response(status=401, mimetype="application/json", response=json.dumps(res))


# test exception 500 with http get
@app.route("/test500")
def test500():
    raise Exception("test exception")


# test exception 401 with http get
@app.route("/test401")
def test401():
    abort(401)


# register 401 error handler
app.register_error_handler(401, error_401_handler)

app.run(host="0.0.0.0")