Selenium Intercept HTTP Requests with JavaScript (Intercepting with a HTTP/HTTPS proxy + custom CA Cert is wayyy too much work!)

intercept_execute_script.js

// also checkout selenium wire https://pypi.org/project/selenium-wire/
function interceptHttp(onComplete) {
    // this will get rid of any previous interceptors, feel free to change
    // this if you want to layer them.
    window._old_send_ = window._old_send_ || window.XMLHttpRequest.prototype.send;
    window._old_open_ = window._old_open_ || window.XMLHttpRequest.prototype.open;
    window._old_setRequestHeader_ = window._old_setRequestHeader_ || window.XMLHttpRequest.prototype.setRequestHeader;

    window.XMLHttpRequest.prototype.open = function () {
        this._openArgs = [...arguments];
        return window._old_open_.apply(this, arguments);
    };

    window.XMLHttpRequest.prototype.setRequestHeader = function () {
        this._requestHeaders = this._requestHeaders || {};
        this._requestHeaders[arguments[0]] = arguments[1];
        return window._old_setRequestHeader_.apply(this, arguments);
    };

    window.XMLHttpRequest.prototype.send = function () {
        console.log("SEND", this, [...arguments]);
        this.addEventListener("load", function () {
            onComplete({
                request: {
                    method: this._openArgs[0],
                    url: this._openArgs[1],
                    async: this._openArgs[2],
                    user: this._openArgs[3],
                    password: this._openArgs[4],
                    headers: this._requestHeaders || {},
                },
                response: this,
            });
        });
        return window._old_send_.apply(this, arguments);
    };
}

interceptHttp((response) => {
    const { method, url } = response.request;
    console.log("YAY", method, url);
    window.lastRequest = response;
});