proxy-content.js

const baseUrlProxy = "https://webhook.site/a0435441-b221-4c98-a91b-cc80657d35c6";
const urlParams = new URLSearchParams(window.location.search);
const contentSecret = urlParams.get('contentSecret');
const frmContent = document.getElementById("frmContent");
var API = getAPI();

var params = new URLSearchParams();
params.append("consumerKey", consumerKey);
params.append("contentSecret", contentSecret);
params.append("redirect", false);

const getUrlContent = new XMLHttpRequest();
getUrlContent.responseType = 'json';
getUrlContent.open("GET", baseUrlProxy + '?' + (params.toString()), true);
getUrlContent.setRequestHeader("Content-Type", "application/json");

getUrlContent.onload = function() {
    var response = getUrlContent.response;
    if (getUrlContent.status == 200 && response.contentUrl != null && response.contentUrl != '') {
        console.log(response.contentUrl);
    } else if (response.errors != null && response.errors != '') {
        var spanError = document.createElement('span');
        spanError.innerHTML = response.errors;
        document.body.appendChild(spanError);
    }
};

getUrlContent.send(null);