:sig
bool ws_is_binary()

:params
return value : true if the current WebSocket message is binary

:see
>websocket

:content
Returns whether the message currently being handled by `WS(Request& context)` arrived as a binary frame.

If this returns `false`, the current message was delivered as a text frame.

Related:

- PHP: WebSocket connection metadata and send APIs in Ratchet, Workerman, or similar server frameworks
- JavaScript / Node.js: browser `WebSocket` properties and Node `ws` server-side connection inspection and send methods
