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.
A string.
| Specification |
|---|
| WebSockets Standard # ref-for-dom-websocket-protocol① |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
protocol |
15 | 12 | 7 | No | 12.1 | 6 | 4.4 | 18 | 7 | 12.1 | 6 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/protocol