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) 
final class io.netty.handler.codec.http.EmptyHttpHeaders$InstanceInitializer
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.http.EmptyHttpHeaders$InstanceInitializer
  super_class: java.lang.Object
{
  private static final io.netty.handler.codec.http.EmptyHttpHeaders EMPTY_HEADERS;
    descriptor: Lio/netty/handler/codec/http/EmptyHttpHeaders;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 183
            new io.netty.handler.codec.http.EmptyHttpHeaders
            dup
            invokespecial io.netty.handler.codec.http.EmptyHttpHeaders.<init>:()V
            putstatic io.netty.handler.codec.http.EmptyHttpHeaders$InstanceInitializer.EMPTY_HEADERS:Lio/netty/handler/codec/http/EmptyHttpHeaders;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.http.EmptyHttpHeaders$InstanceInitializer this
         0: .line 185
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 186
            return
        end local 0 // io.netty.handler.codec.http.EmptyHttpHeaders$InstanceInitializer this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/http/EmptyHttpHeaders$InstanceInitializer;
}
SourceFile: "EmptyHttpHeaders.java"
NestHost: io.netty.handler.codec.http.EmptyHttpHeaders
InnerClasses:
  private final InstanceInitializer = io.netty.handler.codec.http.EmptyHttpHeaders$InstanceInitializer of io.netty.handler.codec.http.EmptyHttpHeaders
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()