Example for the "Callback Hell" with chained web requests

callbackhell.js

request("https://www.andreasjakl.com/wp-content/uploads/2018/08/arcore-anchors.gif", function(error, response, body) {
  if (error) {
    // Handle error
    console.log("Error: ", error);
  } else {
    if (response && response.statusCode == 200) {
      request("https://www.andreasjakl.com/wp-content/uploads/2018/08/SLAM-HoloLens-2000x1163.jpg", function(error, response, body) {
        if (error) {
          console.log("Error: ", error);
        } else {
          console.log("status code:" , response && response.statusCode);
        }
      });
    }
  }
});