http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
interface io.netty.handler.ssl.ApplicationProtocolAccessor
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.netty.handler.ssl.ApplicationProtocolAccessor
  super_class: java.lang.Object
{
  public abstract java.lang.String getNegotiatedApplicationProtocol();
    descriptor: ()Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "ApplicationProtocolAccessor.java"