XMLHttpRequest: XMLHttpRequest() constructor

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is available in Web Workers, except for Service Workers.

The XMLHttpRequest() constructor creates a new XMLHttpRequest.

Syntax

js
new XMLHttpRequest()
// Non-standard
new XMLHttpRequest(options)

Parameters

There are no standard parameters. However, Firefox allows a non-standard parameter:

options

An object that can contain the following flags:

mozAnon

A boolean. When setting this flag to true will cause the browser not to expose the origin and user credentials when fetching resources. Most important, this means that cookies will not be sent unless explicitly added using setRequestHeader.

mozSystem

A boolean. When setting this flag to true, the same origin policy will not be enforced on the request.

Return value

A new XMLHttpRequest object. The object must be prepared by at least calling open() to initialize it before calling send() to send the request to the server.

Specifications

Specification
XMLHttpRequest
# dom-xmlhttprequest

Browser compatibility

See also