如何在 python 中使用 flask 从 post 请求中检索数据

Question

I am working on a rest api using flask. Currently the code for the client is as follows:

new_data = {'msg': message,
        'rec':rec_id,
        'snd':my_id}
        requests.post("http://localhost:33/api/resources/messages/all", json = new_data)

I did print out new_data and it does print fine it does print out fine

{'msg': 'This is a message', 'rec': 1, 'snd': 0}

and the code in the rest api is:

@app.route('/api/resources/messages/all', methods=['GET', 'POST'])
def api_messages():
    if request.method == "GET":
        return jsonify(messages)
    if request.method == "POST":
        sentmsg = request.json
        print (sentmsg)

changing

sentmsg = request.json

to

sentmsg = request.get_json()

did not change anything as it still results in the same error. Specifying the content type also did not result in any changes to the result.

However this code results in the error when attempting to post it.

TypeError: Object of type type is not JSON serializable

How can I change this code in order to make it so the json is passed to the rest api and can be printed out in json form.

Answer 1

The issue did not originate from the code shown in the initial post. The error originates at the start of the code where I declared two of the variables used here:

my_id = int
rec_id = int

Since these 2 variables did not have a value it was causing issues when it was called. As such it resulted in the error message "TypeError: Object of type type is not JSON serializable" (This error message itself gives a good indicator that one or more of the variables used were likely blank and held no value, thus making it unable to specify the data type in the message).

As such giving these variables an actual value caused the program to work fine. A second error that only become obvious after was that request.get_json needed to have brackets after get_json , making it request.get_json() .