WebSocket: extensions 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.extensions read-only property returns the
extensions selected by the server. This is currently only the empty string or a list of
extensions as negotiated by the connection.
Value
A string.
Specifications
| Specification |
|---|
| WebSockets # ref-for-dom-websocket-extensions① |