Content-Type 请求 header 错误处理未正确返回

Question

I created a Flask error handler which will return 415 if Content-Type is not application/json. However, even if I selected an incorrect Content-Type in my Postman tool, I still get 200 response when it should return an error message. What could be the problem?

Here is my code in app.py

from flask import Flask, make_response, jsonify, request

app = Flask(__name__)

@app.errorhandler(415)
def unsupported_media(error):
    content_type = request.content_type('Content-Type')
    if 'Content-Type' in request.headers and content_type != 'application/json':
        return make_response(jsonify(error = 'Content-Type is required to be application/json'), 415)

I also setup incorrect Content-Type value in my postman

Answer 1

errorhandler Register a function to handle errors by code or exception class.

Maybe before_request is what you need.

from flask import Flask, request, abort


app = Flask(__name__)

# This will register the validate function to all the endpoint
@app.before_request
def _is_json():
    if not request.is_json:
        abort(415, 'Content-Type is required to be application/json')

@app.errorhandler(415)
def unsupported_media(error):
    return {'error': error.description}

"""
YOUR router view functions or classes
"""