code: public static void ws(@NotNull String path, @NotNull Consumer<WsHandler> ws) {
          staticInstance().ws(prefixPath(path), ws);
      }
docs: Adds a WebSocket handler on the specified path.
  The method can only be called inside a {@link Javalin#routes(EndpointGroup)}.
  
  @see <a href="https://javalin.io/documentation#websockets">WebSockets in docs</a>