WebTransportError: source property
Baseline
2026
Newly available
Since March 2026, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
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 source read-only property of the WebTransportError interface returns an enumerated value indicating the source of the error.
Value
An enumerated value; can be either stream or session.
Examples
js
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
| Specification |
|---|
| WebTransport # dom-webtransporterror-source |
Browser compatibility
| desktop | mobile | server | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
source
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support
- User must explicitly enable this feature.