Request: signal property

The read-only signal property of the Request interface returns the AbortSignal associated with the request.

Value

An AbortSignal object.

Examples

js

// Create a new abort controller
const controller = new AbortController();

// Create a request with this controller's AbortSignal object
const req = new Request('/', { signal: controller.signal });

// Add an event handler logging a message in case of abort
req.signal.addEventListener("abort", () => {
  console.log("abort");
});

// In case of abort, log the AbortSignal reason, if any
fetch(req).catch(() => {
  if (signal.aborted) {
    if (signal.reason) {
      console.log(`Request aborted with reason: ${signal.reason}`);
    } else {
      console.log("Request aborted but no reason was given.");
    }
  } else {
    console.log("Request not aborted, but terminated abnormally.");
  }
};

// Actually abort the request
controller.abort();

Specifications

Specification
Fetch Standard
# ref-for-dom-request-signal②

Browser compatibility

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