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Does that sound familiar? If yes, then all right, go on with XMLHttpRequest. Otherwise, please head on to Fetch.

The basics

XMLHttpRequest has two modes of operation: synchronous and asynchronous.

Let’s see the asynchronous first, as it’s used in the majority of cases.

To do the request, we need 3 steps:

Create XMLHttpRequest:

The constructor has no arguments.

Initialize it, usually right after new XMLHttpRequest:

This method specifies the main parameters of the request:

• method – HTTP-method. Usually 'GET' or 'POST'.
• URL – The URL to request, a string can be URL  object.
• async – if explicitly set to false, then the request is synchronous, we’ll cover that a bit later.
• user, password – log in and password for basic HTTP auth (if required).