WebSocket: protocol property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
The WebSocket.protocol read-only property returns the name of the sub-protocol the server selected; this will be one of the strings specified in the protocols parameter when creating the WebSocket object, or the empty string if no connection is established.
Value
A string.
Specifications
| Specification |
|---|
| WebSockets # ref-for-dom-websocket-protocol① |