Instead, as soon as the server responds with headers, the Promise will resolve normally (with the ok property of the response set to false if the response isn't in the range 200–299), and it will only reject on network failure or if anything prevented the request from completing. The Promise returned from fetch() won't reject on HTTP error status even if the response is an HTTP 404 or 500.
The fetch specification differs from jQuery.ajax() in the following significant ways: Fetch also provides a single logical place to define other HTTP-related concepts such as CORS and extensions to HTTP. Fetch provides a better alternative that can be easily used by other technologies such as Service Workers. This kind of functionality was previously achieved using XMLHttpRequest. It also provides a global fetch() method that provides an easy, logical way to fetch resources asynchronously across the network. The Fetch API provides a JavaScript interface for accessing and manipulating parts of the protocol, such as requests and responses.
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