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XMLHttpRequest

XMLHttpRequest (XHR) is a built-in browser object that can be used to interact with server. XHR allows you to update data without having to reload a web page. Despite the word XML in its name, XHR not only used to retrieve data with XML format, we can use it with any type of data, like JSON, file(s), and much more.

Free Content Using XMLHttpRequest Network request - XMLHttpRequest