maybe you take a look at this one and a look at W3C: XMLHttpRequest it’s the same if your browser supports xhr.onload. Requires XMLHttpRequest 2) You can also write a wrapping function that emulates xhr.onload if it’s not present. (I think you need to override XMLHttpRequest.prototype.onload = function(args){//calling onreadystatechanges somehow}). If you only support modern … Read more
https://developer.mozilla.org/en/docs/Web/API/Service_Worker_API Service workers essentially act as proxy servers that sit between web applications, and the browser and network (when available). It takes the form of a JavaScript file that can control the web page/site it is associated with, intercepting and modifying navigation and resource requests You register a service worker in your application code from … Read more
As mentioned in the comments, onerror fires when there is a failure on the network level. If the error only exists on the application level, e.g., an HTTP error code is sent, then onload still fires. You need to test the returned status code explicitly in your onreadystatechange handler. Note that a denied cross-domain request … Read more
Existing answers show the general structure for mocking fetch in the browser but omit important details. The accepted answer shows the general pattern for replacing the window.fetch function with custom implementation that intercepts the call and forwards the arguments to fetch. However, the pattern shown doesn’t let the interception function do anything with the response … Read more
Using the Fetch API you could write a function that could download from a URL like this: const downloadFile = (async (url, path) => { const res = await fetch(url); const fileStream = fs.createWriteStream(path); await new Promise((resolve, reject) => { res.body.pipe(fileStream); res.body.on(“error”, reject); fileStream.on(“finish”, resolve); }); });
You have to add processData:false,contentType:false to your method, so that jQuery does not alter the headers or data (which breaks your current code). function uploadFile(blobFile, fileName) { var fd = new FormData(); fd.append(“fileToUpload”, blobFile); $.ajax({ url: “upload.php”, type: “POST”, data: fd, processData: false, contentType: false, success: function(response) { // .. do something }, error: function(jqXHR, … Read more
Easy, just use the HEAD method, instead of GET or POST: function UrlExists(url, callback) { var http = new XMLHttpRequest(); http.open(‘HEAD’, url); http.onreadystatechange = function() { if (this.readyState == this.DONE) { callback(this.status != 404); } }; http.send(); } This is just a short example to show how to use the HEAD method. Production code may … Read more
This feature was introduced last year. You can enable it here: DevTools->Settings->General->Console->Hide network messages. See also Filtering the Console output and Additional settings in the devtools documentation.
HTTP Body Data is the data bytes transmitted in an HTTP transaction message immediately following the headers if there is any (in the case of HTTP/0.9 no headers are transmitted). Most HTTP requests are GET requests without bodies. However, simulating requests with bodies is important to properly stress the proxy code and to test various … Read more
@codemeit is right. His solution looks something like the following using jQuery for the ajax request. This returns the request time in milliseconds. var start_time = new Date().getTime(); jQuery.get(‘your-url’, data, function(data, status, xhr) { var request_time = new Date().getTime() – start_time; });