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.
var protocol = aWebSocket.protocol;
A DOMString.
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'WebSocket: protocol' in that specification. | Living Standard | Initial definition |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | Yes | ? | Yes | ? | Yes | ? |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | ? | Yes | ? | Yes | ? | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/protocol