code: public void setTomcatProtocolHandlerCustomizers(
  			Collection<? extends TomcatProtocolHandlerCustomizer<?>> tomcatProtocolHandlerCustomizer) {
  		Assert.notNull(tomcatProtocolHandlerCustomizer,
  				"TomcatProtocolHandlerCustomizers must not be null");
  		this.tomcatProtocolHandlerCustomizers = new ArrayList<>(
  				tomcatProtocolHandlerCustomizer);
  	}
docs: Set {@link TomcatProtocolHandlerCustomizer}s that should be applied to the Tomcat
  {@link Connector}. Calling this method will replace any existing customizers.
  @param tomcatProtocolHandlerCustomizer the customizers to set
  @since 2.2.0