The handshaking protocol implementation for Hybi-07, which is identical to Hybi-08, and thus is just a thin subclass of Hybi07Handshake that sets a different version number.
Hybi07Handshake
io.undertow.websockets.core.WebSocketChannel which is used for WebSocketVersion#V08
io.undertow.websockets.core.WebSocketChannel
WebSocketVersion#V08