Function WebSocketBeginClientHandshake
pub unsafe fn WebSocketBeginClientHandshake(
hwebsocket: WEB_SOCKET_HANDLE,
pszsubprotocols: Option<&[PCSTR]>,
pszextensions: Option<&[PCSTR]>,
pinitialheaders: Option<&[WEB_SOCKET_HTTP_HEADER]>,
padditionalheaders: *mut *mut WEB_SOCKET_HTTP_HEADER,
puladditionalheadercount: *mut u32,
) -> Result<()>