* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

작성한 코드 및 에러 메세지

app.py

from flask import Flask, render_template, request, jsonify
app = Flask(__name__)

from pymongo import MongoClient
import certifi

ca = certifi.where()
client = MongoClient('mongodb+srv://test:sparta@cluster0.x0kxnse.mongodb.net/Cluster0?retryWrites=true&w=majority', tlsCAFile=ca)
db = client.dbsparta

@app.route('/')
def home():
    return render_template('index.html')

@app.route("/mars", methods=["POST"])
def mars_post():
    name_receive = request.form['name_give']
    address_receive = request.form['address_give']
    size_receive = request.form['size_give']
    doc = {
        'name': name_receive,
        'address': address_receive,
        'size': size_receive
    }
    db.mars.insert_one(doc)

    return jsonify({'msg': '주문 완료!'})

@app.route("/mars", methods=["GET"])
def web_mars_get():
    return jsonify({'msg': 'GET 연결 완료!'})

if __name__ == '__main__':
    app.run('0.0.0.0', port=5000, debug=True)

index.html

<script>
        $(document).ready(function () {
            show_order();
        });

        function show_order() {
            $.ajax({
                type: 'GET',
                url: '/mars',
                data: {},
                success: function (response) {
                    alert(response['msg'])
                }
            });
        }

        function save_order() {
            let name = $('#name').val()
            let address = $('#address').val()
            let size = $('#size').val()

            $.ajax({
                type: 'POST',
                url: '/mars',
                data: {
                    name_give: name,
                    address_give: address,
                    size_give: size
                },
                success: function (response) {
                    alert(response['msg'])
                    window.location.reload()
                }
            });
        }
    </script>