WebTransport: reliability property

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The reliability read-only property of the WebTransport interface indicates whether the connection supports reliable transports only, or whether it also supports unreliable transports (such as UDP).

Value

A string with one of the following values:

pending: The connection has not yet been established. The reliability is not yet known.
reliable-only: The connection only supports reliable transports.
supports-unreliable: The connection supports both unreliable and reliable transports.

Examples

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

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

  // Once ready fulfils the connection can be used
  // Prior to this the reliability is "pending"
  await transport.ready;

  if (transport.reliability === "reliable-only") {
    // Use connection only with reliable transports
  } else {
    // Use connection with either reliable or unreliable transports.
  }
  // …
}

Specifications

WebTransport