老师，远程调试的时候，我在网页端支付成功后，等待他自己跳转，是收到get请求的，但是我支付成功后，立即关闭网页，后台收不到post请求

class PayReturnView(View):
    def get(self, request):
        processed_dict = {}
        for key, value in request.GET.items():
            processed_dict[key] = value

        sign = processed_dict.pop("sign", None)

        pay = AliPay(
            appid="2016092100558978",
            app_notify_url="http://178.128.2.120:8001/userpay_return/",
            app_private_key_path="./private_2048.txt",
            alipay_public_key_path="./alipay_key.txt",  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥,
            debug=True,  # 默认False,
            return_url="http://178.128.2.120:8001/userpay_return/"
        )

        verify_result = pay.verify(processed_dict, sign)

        if verify_result is True:

            # generated by merchant
            out_trade_no = processed_dict.get("out_trade_no", None)
            # generated by alipay
            trade_no = processed_dict.get("trade_no", None)
            trade_status = processed_dict.get("trade_status", None)

            order = Order.objects.get(out_trade_no=out_trade_no)
            order.pay_status = "success"
            order.trade_no = trade_no
            order.pay_time = datetime.now()
            order.save()

            orders = Order.objects.filter(user=request.user)

            return render(request, 'usercenter_order.html', {
                "current_page": "user_center",
                "orders": orders
            })

    def post(self, request):
        processed_dict = {}
        for key, value in request.GET.items():
            processed_dict[key] = value

        sign = processed_dict.pop("sign", None)

        pay = AliPay(
            appid="2016092100558978",
            app_notify_url="http://178.128.2.120:8001/userpay_return/",
            app_private_key_path="./private_2048.txt",
            alipay_public_key_path="./alipay_key.txt",  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥,
            debug=True,  # 默认False,
            return_url="http://178.128.2.120:8001/userpay_return/"
        )

        verify_result = pay.verify(processed_dict, sign)

        if verify_result is True:
            # generated by merchant
            out_trade_no = processed_dict.get("out_trade_no", None)
            # generated by alipay
            trade_no = processed_dict.get("trade_no", None)
            trade_status = processed_dict.get("trade_status", None)

            order = Order.objects.get(out_trade_no=out_trade_no)
            order.pay_status = "success"
            order.pay_time = datetime.now()
            order.trade_no = trade_no
            order.save()
            return HttpResponse("success")