How do you monitor the progress and status of XMLHttpRequest requests?

You should use addEventListener instead of directly adding properties to the XHR object. You can handle the following events: - abort: fired when the request is aborted - error: fired when an error occurred - load: fired when the request is successfully completed - loadend: fired when the request is completed - loadstart: fired when the request is started - progress: fired when data is received - readystatechange: fired when the readyState property changes - timeout: fired when the request has timed out.

// Create a new XMLHttpRequest object const xhr = new XMLHttpRequest(); // Loadstart event xhr.onloadstart = function() { console.log('Request started'); }; // Load event xhr.onload = function() { if (xhr.status === 200) { console.log('Request completed successfully'); } else { console.log(`Request completed with status ${xhr.status}`); } }; // Error event xhr.onerror = function() { console.error('Request failed'); }; // Loadend event xhr.onloadend = function() { console.log('Request finished'); }; // Open the request xhr.open('GET', 'https://reqres.in/api/users?page=2', true); // Send xhr.send();

// Create a new XMLHttpRequest object const xhr = new XMLHttpRequest(); // Set up a function to handle the readyState change events xhr.onreadystatechange = function() { // Check if the request has completed and was successful if (xhr.readyState === 4 && xhr.status === 200) { // Access the response data in different formats console.log('Response Text:', xhr.responseText); console.log('Response XML:', xhr.responseXML); console.log('Response JSON:', xhr.responseText); // Get all headers const allHeaders = xhr.getAllResponseHeaders(); console.log('All Headers:', allHeaders); } }; // Open the request xhr.open('GET', 'https://reqres.in/api/users?page=2', true); // Send xhr.send();

By using the "Network" tab, you can effectively monitor the progress and status of XHR events. The tool provides real-time updates on the request, allows you to inspect request and response details, and enables you to analyze network timing and performance. This information can be invaluable in debugging XHR-related issues and understanding the behavior of XHR requests within your web application.

I made a javascript library as from devtools which can interact in selenium grid 4 construction to push my monitored xhr requests as a json and parse this to a sql lite database This sql lite database is read via a (python) plotty to parse my monitored requests from the browser. I am using AWS fargate selenium grid at scale to do light performance monitoring and bursts of 400 UI users to see if something breaks parrallel in the brower.

Consider additional factors like: 1. Request Headers 2. Response Headers 3. Timing and Performance 4. Error Handling 5. Caching 6. Cross-Origin Requests

You should consider using fetch. It has a more convenient API, except for aborting the request. It also has good browser support by being available in all modern evergreen browsers.