Estoy tratando de hacer una solicitud POST con ajax en js:

 function func() { var gameName = document.getElementById("gname").value; // var uuid = create_UUID() const dataSend ={ "user input": { "game_name": gameName } } console.log("data from user"); console.log(dataSend); $.ajax({ url: 'http://127.0.0.1:5000/responer', contentType: 'application/json', cache: false, method: 'POST', dataType: 'json', data: JSON.stringify(dataSend), success: function(data) { alert.log(data); }, error: function (xhr, ajaxOptions, thrownError) { console.log("ERROR Status:", xhr.status ,"-", thrownError) } }); };

pero me sale el error:

127.0.0.1 - - [04/jul/2022 15:04:17] "OPCIONES /responer?{%22user%20input%22:{%22game_name%22:%22gta%22}}&_=1656936257232 HTTP/1.1" 200 -

400 -

Cuando estoy trabajando con Postman, todo funciona bien y obtengo la respuesta:

127.0.0.1 - - [04/Jul/2022 15:01:12] "POST /responer HTTP/1.1" 200 -

Mi lado de python usando matraz:

 from flask import Flask, request, jsonify, render_template from flask_cors import CORS import main import json app = Flask(__name__) CORS(app) # cors = CORS(app) #Create the receiver API POST endpoint: @app.route("/responer", methods=["POST","GET"]) def postME(): request_data = request.get_json() print("data recived: " + str(request_data)) res_data = main.response(request_data) #method that returns the response json response = app.response_class( response=json.dumps(res_data), status=200, mimetype='application/json' ) return response