WebTransport

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 WebTransport interface of the WebTransport API provides functionality to enable a user agent to connect to an HTTP/3 server, initiate reliable and unreliable transport in either or both directions, and close the connection once it is no longer needed.

Constructor

WebTransport(): Creates a new WebTransport object instance.

Instance properties

closed Read only: Returns a promise that resolves when the transport is closed.
datagrams Read only: Returns a WebTransportDatagramDuplexStream instance that can be used to send and receive datagrams.
congestionControl Read only Experimental: Returns a string that indicates the application preference for either high throughput or low-latency when sending data.
incomingBidirectionalStreams Read only: Represents one or more bidirectional streams opened by the server. Returns a ReadableStream of WebTransportBidirectionalStream objects. Each one can be used to read data from the server and write data back to it.
incomingUnidirectionalStreams Read only: Represents one or more unidirectional streams opened by the server. Returns a ReadableStream of WebTransportReceiveStream objects. Each one can be used to read data from the server.
ready Read only: Returns a promise that resolves when the transport is ready to use.
reliability Read only Experimental: Returns a string that indicates whether the connection supports reliable transports only, or whether it also supports unreliable transports (such as UDP).