How to make AJAX request in Hackerrank using JavaScript?

I open the Hackerrank example test and play around with methods one might use to make an AJAX call. XMLHttpReq, fetch, etc. None of them work; XHR and fetch methods are unavailable. First fetch: async …

Can’t make new fetch request after aborting previous

I need to change a parameters that defines what data should come from my requests, also this application needs to refresh every fixed interval of time. If the user changes the parameter of interest in the middle of a previous refresh request things start to behave strange and some unexpected behavior occurs. So my approach was to abort all previous requests before starting the new ones, but after using await controller.abort() it seems that the next requests are never triggered, Do I need to clear the signal or something like that? What happens is that secondData always is undefined, actually

URL of open(…) relative or absolute

I don’t quite understand the functioning of the url parameter of XMLHttpRequest open(method, url, async). Let’s say I have a web server like that: page.html sends an asynchronous request to …

Javascript – How to know the type of the response in Fetch API?

How to know the type of the response in Fetch API? In XMLHttpRequest, there’s the responseType property which indicates the type of the returned response’s body (json, text, blob, etc.). While in the …

Intercept fetch() API requests and responses in JavaScript

I want to intercept fetch API requests and responses in JavaScript. For example, before sending the request I want to intercept the request URL. I’d like to intercept the response once it arrives as …

How do I promisify native XHR?

I want to use (native) promises in my frontend app to perform XHR request but without all the tomfoolery of a massive framework. I want my xhr to return a promise but this doesn’t work (giving me: …

reading in utf-8 file (javascript XMLHttpRequest) gives bad european characters

can anyone help? I have small procedure to read in an UTF-8 file with javascript using XMLHttpRequest.. this file has european characters like miércoles sábado etc.. Notice the accents.. But when …