Guide
WebSockets
H3 has built-in support for cross platform WebSocket and SSE.
H3 natively supports runtime agnostic WebSocket API using CrossWS.
You can define WebSocket handlers in your exisiting Event Handlers to define multiple websocket handlers, dynamically matched with your same route defenitions!
WebSockets support is currently experimental and available in nightly channel.
Usage
Example
You can use
npx listhen --ws -w websocket.ts to run this exampleServer Sent Events (SSE)
As an alternative to WebSockets, you can use Server-sent events.
H3 has a built-in API to create server-sent events using createEventStream(event) utility.
SSE support is currently experimental and available in nightly channel.