Javascript 拦截和修改XMLHttpRequests

我正在编写一个扩展，使用户可以拦截任何ajax请求并对其进行修改。下面的代码可以工作。它将截获xmlhttprequest打开/发送，并用对话框提示我。问题是，我在xmlhttprequest.open中使用了prompt（），而不是我希望它能够使用的promptOpen（）方法。我想知道是否有人知道我需要做什么才能让它工作

(function(){

    async function promptSend(data){
        return new Promise(function(resolve){
            var swalConfig = {
                html: `<textarea id="swal-input1" class="" rows="10" cols="50"></textarea><br><br>`,
                focusConfirm: false,
                preConfirm: () => {
                    resolve([document.getElementById("swal-input1").value])
                },
                onBeforeOpen: () => {
                    document.getElementById("swal-input1").value = data[0];

                },
                showCancelButton: false,
                allowOutsideClick: false
            };

            try{
                Swal.getQueueStep(); 
                Swal.insertQueueStep(swalConfig)
            }catch(e){
                Swal.queue([swalConfig])            
            }

        });
    }

    async function promptOpen(data){
        return new Promise(function(resolve){
            var swalConfig = {
                html: `<label for='swal-input1'>Method</label><input name='swal-input1' id='swal-input1' style='width:100%'><br><br>`+
                      `<label for='swal-input2'>Url</label><input name='swal-input2' id='swal-input2' style='width:100%'>`,
                focusConfirm: false,
                preConfirm: () => {
                    resolve([document.getElementById("swal-input1").value,document.getElementById("swal-input2").value])
                },
                onBeforeOpen: () => {
                    document.getElementById("swal-input1").value = data[0];
                    document.getElementById("swal-input2").value = data[1];
                },
                showCancelButton: false,
                allowOutsideClick: false
            };

            try{
                Swal.getQueueStep();
                Swal.insertQueueStep(swalConfig)
            }catch(e){
                Swal.queue([swalConfig])            
            }
        })

    }


    // Intercepts all XmlHttpRequest.open calls
    var proxiedOpen = window.XMLHttpRequest.prototype.open;
    window.XMLHttpRequest.prototype.open = function(method, url, async, user, password) {

        //let newArguments = await promptOpen(arguments)
        arguments[0] = prompt("Enter Method",arguments[0])
        arguments[1] = prompt("Enter Url",arguments[1])

        return proxiedOpen.apply(this, [].slice.call(arguments));
    }


    // Intercepts all XmlHttpRequest.send calls
    var proxiedSend = window.XMLHttpRequest.prototype.send;
    window.XMLHttpRequest.prototype.send = async function() {

        let newArgument = await promptSend(arguments);
        arguments[0] = newArgument[0];

        return proxiedSend.apply(this, [].slice.call(arguments));
    }

})()

但正如我所说，它根本不做任何ajax请求，甚至不提示xmlhttprequest.send框

var proxiedOpen = window.XMLHttpRequest.prototype.open;
window.XMLHttpRequest.prototype.open = async function(method, url, async, user, password) {
    let newArguments = await promptOpen(arguments)
    arguments[0] = newArguments[0]
    arguments[1] = newArguments[1]

    return proxiedOpen.apply(this, [].slice.call(arguments));
}