code: public static void ws(@NotNull String path, @NotNull Consumer<WsHandler> ws, @NotNull Set<Role> permittedRoles) {
          staticInstance().ws(prefixPath(path), ws, permittedRoles);
      }
docs: Adds a WebSocket handler with the given roles for 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>