files/en-us/web/api/webtransporterror/source/index.md
{{APIRef("WebTransport API")}}{{SecureContext_Header}} {{AvailableInWorkers}}
The source read-only property of the {{domxref("WebTransportError")}} interface returns an enumerated value indicating the source of the error.
An enumerated value; can be either stream or session.
const url = "not-a-url";
async function initTransport(url) {
try {
// Initialize transport connection
const transport = new WebTransport(url);
// The connection can be used once ready fulfills
await transport.ready;
// …
} catch (error) {
const msg = `Transport initialization failed.
Reason: ${error.message}.
Source: ${error.source}.
Error code: ${error.streamErrorCode}.`;
console.log(msg);
}
}
{{Specifications}}
{{Compat}}