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) 
public interface io.netty.handler.codec.DefaultHeaders$NameValidator<K>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.netty.handler.codec.DefaultHeaders$NameValidator
  super_class: java.lang.Object
{
  public static final io.netty.handler.codec.DefaultHeaders$NameValidator NOT_NULL;
    descriptor: Lio/netty/handler/codec/DefaultHeaders$NameValidator;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 67
            new io.netty.handler.codec.DefaultHeaders$NameValidator$1
            dup
            invokespecial io.netty.handler.codec.DefaultHeaders$NameValidator$1.<init>:()V
            putstatic io.netty.handler.codec.DefaultHeaders$NameValidator.NOT_NULL:Lio/netty/handler/codec/DefaultHeaders$NameValidator;
         1: .line 72
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public abstract void validateName();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TK;)V
    MethodParameters:
      Name  Flags
      name  
}
Signature: <K:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "DefaultHeaders.java"
NestHost: io.netty.handler.codec.DefaultHeaders
InnerClasses:
  public abstract NameValidator = io.netty.handler.codec.DefaultHeaders$NameValidator of io.netty.handler.codec.DefaultHeaders
  io.netty.handler.codec.DefaultHeaders$NameValidator$1