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XMLHttpRequest: timeout property

The XMLHttpRequest.timeout property is an unsigned long representing the number of milliseconds a request can take before automatically being terminated. The default value is 0, which means there is no timeout. Timeout shouldn't be used for synchronous XMLHttpRequests requests used in a document environment or it will throw an InvalidAccessError exception. When a timeout happens, a timeout event is fired.

Note: You may not use a timeout for synchronous requests with an owning window.

Using a timeout with an asynchronous request

Example

const xhr = new XMLHttpRequest();
xhr.open("GET", "/server", true);

xhr.timeout = 2000; // time in milliseconds

xhr.onload = () => {
  // Request finished. Do processing here.
};

xhr.ontimeout = (e) => {
  // XMLHttpRequest timed out. Do something here.
};

xhr.send(null);

Specifications

Specification
XMLHttpRequest Standard # the-timeout-attribute

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`timeout`	29	12	12	8	1712–16	7	4.4	29	14	1812–16	7	2.0

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https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/timeout