WebTransportReceiveStream: getStats() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used 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 getStats() method of the WebTransportReceiveStream interface asynchronously returns an object containing statistics for the current stream.
The statistics include the total number of ordered bytes that have arrived on this stream (ignoring network overhead, up until the first missing byte) and the total number that have been read by the application. It therefore provides a measure of how quickly the application is consuming bytes from the server on this particular stream.
Syntax
getStats()
Parameters
None.
Return value
A Promise that resolves to an object containing statistics about the current stream.
The returned object has the following properties:
timestamp-
A
DOMHighResTimeStampindicating the timestamp at which the statistics were gathered, relative to Jan 1, 1970, UTC. bytesReceived-
A positive integer indicating the number of bytes received by this stream, up to the first missing byte. The number does not include any network overhead, and can only increase.
bytesRead-
A positive integer indicating the number of bytes the application has read from this
WebTransportReceiveStreamstream. This number can only increase, and is always less than or equal tobytesReceived.
Examples
The code snippet below uses await to wait on the Promise returned by getStats().
When the promise fulfills, the number of bytes that have not yet been read is logged to the console.
const stats = await stream.getStats();
const unConsumedBytes = stats.bytesReceived - stats.bytesRead;
console.log(`Bytes in reader queue: ${unConsumedBytes}`);
Specifications
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| WebTransport # dom-webtransportreceivestream-getstats |
Browser compatibility
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Legend
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- User must explicitly enable this feature.