https://spring.io/projects/spring-boot: Spring Boot (Pivotal Software, Inc.) 
public interface org.springframework.boot.web.embedded.netty.NettyRouteProvider extends java.util.function.Function<HttpServerRoutes, HttpServerRoutes>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.springframework.boot.web.embedded.netty.NettyRouteProvider
  super_class: java.lang.Object
{
}
Signature: Ljava/lang/Object;Ljava/util/function/Function<LHttpServerRoutes;LHttpServerRoutes;>;
SourceFile: "NettyRouteProvider.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()