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WebTransport: closed property

The closed read-only property of the WebTransport interface returns a promise that resolves when the transport is closed.

Note: This feature is available in Web Workers

Value

A Promise that resolves to an object containing the following properties:

closeCode

A number representing the error code for the error.

reason

A string representing the reason for closing the WebTransport.

Examples

js

const url = "https://example.com:4999/wt";

async function initTransport(url) {
  // Initialize transport connection
  const transport = new WebTransport(url);

  // The connection can be used once ready fulfills
  await transport.ready;

  // ...
}

// ...

async function closeTransport(transport) {
  // Respond to connection closing
  try {
    await transport.closed;
    console.log(`The HTTP/3 connection to ${url} closed gracefully.`);
  } catch (error) {
    console.error(`The HTTP/3 connection to ${url} closed due to ${error}.`);
  }
}

Specifications

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
closed 97 97 114 No 83 No 97 97 114 68 No 18.0

See also

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https://developer.mozilla.org/en-US/docs/Web/API/WebTransport/closed