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.http.HttpServerUpgradeHandler$UpgradeCodec
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.netty.handler.codec.http.HttpServerUpgradeHandler$UpgradeCodec
  super_class: java.lang.Object
{
  public abstract java.util.Collection<java.lang.CharSequence> requiredUpgradeHeaders();
    descriptor: ()Ljava/util/Collection;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Ljava/util/Collection<Ljava/lang/CharSequence;>;

  public abstract boolean prepareUpgradeResponse(io.netty.channel.ChannelHandlerContext, io.netty.handler.codec.http.FullHttpRequest, io.netty.handler.codec.http.HttpHeaders);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;Lio/netty/handler/codec/http/HttpHeaders;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
                Name  Flags
      ctx             
      upgradeRequest  
      upgradeHeaders  

  public abstract void upgradeTo(io.netty.channel.ChannelHandlerContext, io.netty.handler.codec.http.FullHttpRequest);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
                Name  Flags
      ctx             
      upgradeRequest  
}
SourceFile: "HttpServerUpgradeHandler.java"
NestHost: io.netty.handler.codec.http.HttpServerUpgradeHandler
InnerClasses:
  public abstract UpgradeCodec = io.netty.handler.codec.http.HttpServerUpgradeHandler$UpgradeCodec of io.netty.handler.codec.http.HttpServerUpgradeHandler