4-7강 6분정도부터 막혀요. 코드에서 뭐가 문제인지 모르겠어요..

app.py

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

from pymongo import MongoClient
client = MongoClient('mongodb+srv://test:sparta@cluster0.7bujz.mongodb.net/Cluster0?retryWrites=true&w=majority')
db = client.dbsparta

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

@app.route("/mars", methods=["POST"])
def web_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>