WebSocket: protocol property

{{APIRef("WebSockets API")}}{{AvailableInWorkers}}

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 {{domxref("WebSocket")}} object, or the empty string if no connection is established.

Value

A string.

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{httpheader("Sec-WebSocket-Protocol")}}