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XMLHttpRequest is an API that provides client functionality for transferring data between a client and a server. It provides an easy way to retrieve data from a URL without having to do a full page refresh. This enables a Web page to update just a part of the page without disrupting what the user is doing.  XMLHttpRequest is used heavily in AJAX programming.
AJAX API HTTP Interface Reference Web XHR


The GlobalFetch mixin of the Fetch API contains the GlobalFetch.fetch() method used to start the process of fetching a resource.
API Experimental Fetch GlobalFetch HTTP Interface Networking Reference request


In the following code snippet, we make a request to open a database, and include handlers for the success and error cases. For a full working example, see our To-do Notifications app (view example live.)
API HTTP IndexedDB Interface Offline offline Reference storage Storage


The XMLHttpRequest.abort() method aborts the request if it has already been sent. When a request is aborted, its readyState is set to 0 (UNSENT), but the readystatechange event is not fired.
abort AJAX API HTTP HttpRequest Method Reference XHR XMLHttpRequest


The PerformanceTiming.fetchStart read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, the browser is ready to fetch the document using an HTTP request. This moment is before the check to any application cache.
API HTTP request Navigation Timing PerformanceTiming Property Read-only Reference Référence