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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/timeout below:

XMLHttpRequest: timeout property - Web APIs

XMLHttpRequest: timeout property

Baseline Widely available

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

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 Browser compatibility

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