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 final class io.netty.handler.codec.DefaultHeadersImpl<K, V> extends io.netty.handler.codec.DefaultHeaders<K, V, io.netty.handler.codec.DefaultHeadersImpl<K, V>>
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.DefaultHeadersImpl
  super_class: io.netty.handler.codec.DefaultHeaders
{
  public void <init>(io.netty.util.HashingStrategy<K>, io.netty.handler.codec.ValueConverter<V>, io.netty.handler.codec.DefaultHeaders$NameValidator<K>);
    descriptor: (Lio/netty/util/HashingStrategy;Lio/netty/handler/codec/ValueConverter;Lio/netty/handler/codec/DefaultHeaders$NameValidator;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // io.netty.handler.codec.DefaultHeadersImpl this
        start local 1 // io.netty.util.HashingStrategy nameHashingStrategy
        start local 2 // io.netty.handler.codec.ValueConverter valueConverter
        start local 3 // io.netty.handler.codec.DefaultHeaders$NameValidator nameValidator
         0: .line 27
            aload 0 /* this */
            aload 1 /* nameHashingStrategy */
            aload 2 /* valueConverter */
            aload 3 /* nameValidator */
            invokespecial io.netty.handler.codec.DefaultHeaders.<init>:(Lio/netty/util/HashingStrategy;Lio/netty/handler/codec/ValueConverter;Lio/netty/handler/codec/DefaultHeaders$NameValidator;)V
         1: .line 28
            return
        end local 3 // io.netty.handler.codec.DefaultHeaders$NameValidator nameValidator
        end local 2 // io.netty.handler.codec.ValueConverter valueConverter
        end local 1 // io.netty.util.HashingStrategy nameHashingStrategy
        end local 0 // io.netty.handler.codec.DefaultHeadersImpl this
      LocalVariableTable:
        Start  End  Slot                 Name  Signature
            0    2     0                 this  Lio/netty/handler/codec/DefaultHeadersImpl<TK;TV;>;
            0    2     1  nameHashingStrategy  Lio/netty/util/HashingStrategy<TK;>;
            0    2     2       valueConverter  Lio/netty/handler/codec/ValueConverter<TV;>;
            0    2     3        nameValidator  Lio/netty/handler/codec/DefaultHeaders$NameValidator<TK;>;
    Signature: (Lio/netty/util/HashingStrategy<TK;>;Lio/netty/handler/codec/ValueConverter<TV;>;Lio/netty/handler/codec/DefaultHeaders$NameValidator<TK;>;)V
    MethodParameters:
                     Name  Flags
      nameHashingStrategy  
      valueConverter       
      nameValidator        
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Lio/netty/handler/codec/DefaultHeaders<TK;TV;Lio/netty/handler/codec/DefaultHeadersImpl<TK;TV;>;>;
SourceFile: "DefaultHeadersImpl.java"
InnerClasses:
  public abstract NameValidator = io.netty.handler.codec.DefaultHeaders$NameValidator of io.netty.handler.codec.DefaultHeaders