docs: @Bean
  	@ConditionalOnMissingBean(PreDecorationFilter.class)
  	public PreDecorationFilter preDecorationFilter(RouteLocator routeLocator,
  			ProxyRequestHelper proxyRequestHelper) {
  		return new PreDecorationFilter(routeLocator,
  				this.server.getServlet().getContextPath(), this.zuulProperties,
  				proxyRequestHelper);
  	}