code: public WebSocketRoute to(String url) {
          Objects.requireNonNull(url, Required.URL.toString());
  
          if ('/' != url.charAt(0)) {
              url = "/" + url;
          }
          
          this.url = url;
          
          Router.addRoute(this);  
          
          return this;
      }
docs: Sets the URL for this route
  
  @param url The URL for this WebSocket route
  @return WebSocketRoute instance