What are the steps for implementing CORS?

I recently attempted to set up Ajax calls and stumbled upon the following code snippet:

<!DOCTYPE html>
<html>
<body>

    <p id="demo">Let AJAX update this text.</p>

    <button type="button" onclick="loadDoc()">Update Content</button>

    <script>
    function loadDoc() {
      var xhttp;
      if (window.XMLHttpRequest) {

        xhttp = new XMLHttpRequest();
        } else {

        xhttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      xhttp.onreadystatechange = function() {
        if (xhttp.readyState == 4 && xhttp.status == 200) {
          document.getElementById("demo").innerHTML = xhttp.responseText;
        }
      }
      xhttp.open("GET", "www.google.com", true);
      xhttp.send();
    }
    </script>

    </body>
    </html>

As I tried to access the URL, an error message stating "XHR cannot load" appeared. I understand that it has something to do with CORS. Despite consulting various resources, I am struggling to comprehend the issue. Can someone please clarify and help resolve this matter? Any assistance would be greatly appreciated.

Answer №1

Google prohibits cross-domain access to their search engine. Your approach appears fine, but the URL you are attempting to access does not permit your domain.

Consider testing it with a file hosted on your own local machine instead.

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