How to capture JSON response of XMLHTTPRequest POST via Edge extension? RRS feed

  • Question

  • Hi,

    I am trying to fetch data from a web page. I found its data come from 2 JSON files. The web page sends 2 XMLHTTPRequest (POST) to server, and the server would response with the 2 JSON files. That's why I am trying to capture the 2 JSON files.

    I tried to develop an Edge extension to raise same XMLHTTPRequest, but I encounter Cross-Origin Resource Sharing (CORS) limitation on Edge. I am new on front-end development. Anybody know how to capture web page's background JSON data? Or how to resolve CORS limitation?


    Albert Ye

    Wednesday, August 15, 2018 9:47 AM

All replies

  • Hi Albert Ye,

    Try to refer Fetch Api. MS Edge support it.

    It may help you to solve the issue.

    Fetch (or the undeniable limitations of XHR)

    Fetch Api



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    Thursday, August 16, 2018 3:15 AM
  • Hi Deepak,

    I tried this, but nothing returned.

    This is manifest.json.

        "name": "守望先锋生涯数据助手",
        "author": "上海咆哮帝",
        "version": "0.1",
        "description": "用于辅助守望先锋玩家整理生涯数据",
        "permission": ["**"],
        "browser_action": {
            "default_icon": {
                "20": "images/Overwatch-128.png",
                "40": "images/Overwatch-128.png"
            "default_title": "Overwatch Insight Assistance",
            "default_popup": "popup.html"
        "icons": {
            "20": "images/Overwatch-128.png",
            "40": "images/Overwatch-128.png"

    This is the extension content.

            <link rel="stylesheet" type="text/css" href="css/styles.css" />
            <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
            <button id="cap">获取数据</button>
            <button id="exp">导出数据</button>
            <button id="upl">上传数据</button>
            <script src="js/popup.js"></script>

    And this is popup.js.

    var cap=document.getElementById('cap');
    var exp=document.getElementById('exp');
    var upl=document.getElementById('upl');
    // clk=function(){
    //     alert('Test');
    // }
        var url="";
        fetch(url, {method: 'POST', headers: 'application/json; charset=utf-8', credentials: 'include'}).then(function(res){
            var jjj=res.json();

    This is the CSS file, but I don't think it's important to this problem.

    * {
        font-family: 'Segoe UI';
    h1 {
        font-weight: 600;
        font-size: .9em;
    p {
        font-weight: 500;
        font-size: .8em;
        margin-bottom: 10px;


    Monday, August 20, 2018 5:59 PM
  • Hi Deepak,

    By the way, I have read this.

    How we captured AJAX requests from a website tab with a Chrome Extension



    Monday, August 20, 2018 6:03 PM