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Converting jQuery to Vanilla Javascript: Ajax via Fetch

The Fetch API provides a JavaScript interface for accessing and manipulating parts of the HTTP pipeline, such as requests and responses. It also provides a global fetch() method that provides an easy, logical way to fetch resources asynchronously across the network.

This kind of functionality was previously achieved using XMLHttpRequest. Fetch provides a better alternative that can be easily used by other technologies such as Service Workers. Fetch also provides a single logical place to define other HTTP-related concepts such as CORS and extensions to HTTP.

The fetch specification differs from jQuery.ajax() in the following significant ways:

A basic fetch request is really simple to set up.

Read More at https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch

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