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 class io.netty.example.http.websocketx.server.WebSocketIndexPageHandler extends io.netty.channel.SimpleChannelInboundHandler<io.netty.handler.codec.http.FullHttpRequest>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.example.http.websocketx.server.WebSocketIndexPageHandler
  super_class: io.netty.channel.SimpleChannelInboundHandler
{
  private final java.lang.String websocketPath;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.example.http.websocketx.server.WebSocketIndexPageHandler this
        start local 1 // java.lang.String websocketPath
         0: .line 48
            aload 0 /* this */
            invokespecial io.netty.channel.SimpleChannelInboundHandler.<init>:()V
         1: .line 49
            aload 0 /* this */
            aload 1 /* websocketPath */
            putfield io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.websocketPath:Ljava/lang/String;
         2: .line 50
            return
        end local 1 // java.lang.String websocketPath
        end local 0 // io.netty.example.http.websocketx.server.WebSocketIndexPageHandler this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    3     0           this  Lio/netty/example/http/websocketx/server/WebSocketIndexPageHandler;
            0    3     1  websocketPath  Ljava/lang/String;
    MethodParameters:
               Name  Flags
      websocketPath  

  protected void channelRead0(io.netty.channel.ChannelHandlerContext, io.netty.handler.codec.http.FullHttpRequest);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=6, locals=6, args_size=3
        start local 0 // io.netty.example.http.websocketx.server.WebSocketIndexPageHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.handler.codec.http.FullHttpRequest req
         0: .line 55
            aload 2 /* req */
            invokeinterface io.netty.handler.codec.http.FullHttpRequest.decoderResult:()Lio/netty/handler/codec/DecoderResult;
            invokevirtual io.netty.handler.codec.DecoderResult.isSuccess:()Z
            ifne 3
         1: .line 56
            aload 1 /* ctx */
            aload 2 /* req */
            new io.netty.handler.codec.http.DefaultFullHttpResponse
            dup
            getstatic io.netty.handler.codec.http.HttpVersion.HTTP_1_1:Lio/netty/handler/codec/http/HttpVersion;
            getstatic io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST:Lio/netty/handler/codec/http/HttpResponseStatus;
            invokespecial io.netty.handler.codec.http.DefaultFullHttpResponse.<init>:(Lio/netty/handler/codec/http/HttpVersion;Lio/netty/handler/codec/http/HttpResponseStatus;)V
            invokestatic io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.sendHttpResponse:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;Lio/netty/handler/codec/http/FullHttpResponse;)V
         2: .line 57
            return
         3: .line 61
      StackMap locals:
      StackMap stack:
            aload 2 /* req */
            invokeinterface io.netty.handler.codec.http.FullHttpRequest.method:()Lio/netty/handler/codec/http/HttpMethod;
            getstatic io.netty.handler.codec.http.HttpMethod.GET:Lio/netty/handler/codec/http/HttpMethod;
            if_acmpeq 6
         4: .line 62
            aload 1 /* ctx */
            aload 2 /* req */
            new io.netty.handler.codec.http.DefaultFullHttpResponse
            dup
            getstatic io.netty.handler.codec.http.HttpVersion.HTTP_1_1:Lio/netty/handler/codec/http/HttpVersion;
            getstatic io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN:Lio/netty/handler/codec/http/HttpResponseStatus;
            invokespecial io.netty.handler.codec.http.DefaultFullHttpResponse.<init>:(Lio/netty/handler/codec/http/HttpVersion;Lio/netty/handler/codec/http/HttpResponseStatus;)V
            invokestatic io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.sendHttpResponse:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;Lio/netty/handler/codec/http/FullHttpResponse;)V
         5: .line 63
            return
         6: .line 67
      StackMap locals:
      StackMap stack:
            ldc "/"
            aload 2 /* req */
            invokeinterface io.netty.handler.codec.http.FullHttpRequest.uri:()Ljava/lang/String;
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 7
            ldc "/index.html"
            aload 2 /* req */
            invokeinterface io.netty.handler.codec.http.FullHttpRequest.uri:()Ljava/lang/String;
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 14
         7: .line 68
      StackMap locals:
      StackMap stack:
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.pipeline:()Lio/netty/channel/ChannelPipeline;
            aload 2 /* req */
            aload 0 /* this */
            getfield io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.websocketPath:Ljava/lang/String;
            invokestatic io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.getWebSocketLocation:(Lio/netty/channel/ChannelPipeline;Lio/netty/handler/codec/http/HttpRequest;Ljava/lang/String;)Ljava/lang/String;
            astore 3 /* webSocketLocation */
        start local 3 // java.lang.String webSocketLocation
         8: .line 69
            aload 3 /* webSocketLocation */
            invokestatic io.netty.example.http.websocketx.server.WebSocketServerIndexPage.getContent:(Ljava/lang/String;)Lio/netty/buffer/ByteBuf;
            astore 4 /* content */
        start local 4 // io.netty.buffer.ByteBuf content
         9: .line 70
            new io.netty.handler.codec.http.DefaultFullHttpResponse
            dup
            getstatic io.netty.handler.codec.http.HttpVersion.HTTP_1_1:Lio/netty/handler/codec/http/HttpVersion;
            getstatic io.netty.handler.codec.http.HttpResponseStatus.OK:Lio/netty/handler/codec/http/HttpResponseStatus;
            aload 4 /* content */
            invokespecial io.netty.handler.codec.http.DefaultFullHttpResponse.<init>:(Lio/netty/handler/codec/http/HttpVersion;Lio/netty/handler/codec/http/HttpResponseStatus;Lio/netty/buffer/ByteBuf;)V
            astore 5 /* res */
        start local 5 // io.netty.handler.codec.http.FullHttpResponse res
        10: .line 72
            aload 5 /* res */
            invokeinterface io.netty.handler.codec.http.FullHttpResponse.headers:()Lio/netty/handler/codec/http/HttpHeaders;
            getstatic io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE:Lio/netty/util/AsciiString;
            ldc "text/html; charset=UTF-8"
            invokevirtual io.netty.handler.codec.http.HttpHeaders.set:(Ljava/lang/CharSequence;Ljava/lang/Object;)Lio/netty/handler/codec/http/HttpHeaders;
            pop
        11: .line 73
            aload 5 /* res */
            aload 4 /* content */
            invokevirtual io.netty.buffer.ByteBuf.readableBytes:()I
            i2l
            invokestatic io.netty.handler.codec.http.HttpUtil.setContentLength:(Lio/netty/handler/codec/http/HttpMessage;J)V
        12: .line 75
            aload 1 /* ctx */
            aload 2 /* req */
            aload 5 /* res */
            invokestatic io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.sendHttpResponse:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;Lio/netty/handler/codec/http/FullHttpResponse;)V
        end local 5 // io.netty.handler.codec.http.FullHttpResponse res
        end local 4 // io.netty.buffer.ByteBuf content
        end local 3 // java.lang.String webSocketLocation
        13: .line 76
            goto 15
        14: .line 77
      StackMap locals:
      StackMap stack:
            aload 1 /* ctx */
            aload 2 /* req */
            new io.netty.handler.codec.http.DefaultFullHttpResponse
            dup
            getstatic io.netty.handler.codec.http.HttpVersion.HTTP_1_1:Lio/netty/handler/codec/http/HttpVersion;
            getstatic io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND:Lio/netty/handler/codec/http/HttpResponseStatus;
            invokespecial io.netty.handler.codec.http.DefaultFullHttpResponse.<init>:(Lio/netty/handler/codec/http/HttpVersion;Lio/netty/handler/codec/http/HttpResponseStatus;)V
            invokestatic io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.sendHttpResponse:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;Lio/netty/handler/codec/http/FullHttpResponse;)V
        15: .line 79
      StackMap locals:
      StackMap stack:
            return
        end local 2 // io.netty.handler.codec.http.FullHttpRequest req
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.http.websocketx.server.WebSocketIndexPageHandler this
      LocalVariableTable:
        Start  End  Slot               Name  Signature
            0   16     0               this  Lio/netty/example/http/websocketx/server/WebSocketIndexPageHandler;
            0   16     1                ctx  Lio/netty/channel/ChannelHandlerContext;
            0   16     2                req  Lio/netty/handler/codec/http/FullHttpRequest;
            8   13     3  webSocketLocation  Ljava/lang/String;
            9   13     4            content  Lio/netty/buffer/ByteBuf;
           10   13     5                res  Lio/netty/handler/codec/http/FullHttpResponse;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   
      req   

  public void exceptionCaught(io.netty.channel.ChannelHandlerContext, java.lang.Throwable);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Throwable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=3, args_size=3
        start local 0 // io.netty.example.http.websocketx.server.WebSocketIndexPageHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Throwable cause
         0: .line 83
            aload 2 /* cause */
            invokevirtual java.lang.Throwable.printStackTrace:()V
         1: .line 84
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.close:()Lio/netty/channel/ChannelFuture;
            pop
         2: .line 85
            return
        end local 2 // java.lang.Throwable cause
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.http.websocketx.server.WebSocketIndexPageHandler this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lio/netty/example/http/websocketx/server/WebSocketIndexPageHandler;
            0    3     1    ctx  Lio/netty/channel/ChannelHandlerContext;
            0    3     2  cause  Ljava/lang/Throwable;
    MethodParameters:
       Name  Flags
      ctx    
      cause  

  private static void sendHttpResponse(io.netty.channel.ChannelHandlerContext, io.netty.handler.codec.http.FullHttpRequest, io.netty.handler.codec.http.FullHttpResponse);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;Lio/netty/handler/codec/http/FullHttpResponse;)V
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // io.netty.channel.ChannelHandlerContext ctx
        start local 1 // io.netty.handler.codec.http.FullHttpRequest req
        start local 2 // io.netty.handler.codec.http.FullHttpResponse res
         0: .line 89
            aload 2 /* res */
            invokeinterface io.netty.handler.codec.http.FullHttpResponse.status:()Lio/netty/handler/codec/http/HttpResponseStatus;
            invokevirtual io.netty.handler.codec.http.HttpResponseStatus.code:()I
            sipush 200
            if_icmpeq 5
         1: .line 90
            aload 2 /* res */
            invokeinterface io.netty.handler.codec.http.FullHttpResponse.status:()Lio/netty/handler/codec/http/HttpResponseStatus;
            invokevirtual io.netty.handler.codec.http.HttpResponseStatus.toString:()Ljava/lang/String;
            getstatic io.netty.util.CharsetUtil.UTF_8:Ljava/nio/charset/Charset;
            invokestatic io.netty.buffer.Unpooled.copiedBuffer:(Ljava/lang/CharSequence;Ljava/nio/charset/Charset;)Lio/netty/buffer/ByteBuf;
            astore 3 /* buf */
        start local 3 // io.netty.buffer.ByteBuf buf
         2: .line 91
            aload 2 /* res */
            invokeinterface io.netty.handler.codec.http.FullHttpResponse.content:()Lio/netty/buffer/ByteBuf;
            aload 3 /* buf */
            invokevirtual io.netty.buffer.ByteBuf.writeBytes:(Lio/netty/buffer/ByteBuf;)Lio/netty/buffer/ByteBuf;
            pop
         3: .line 92
            aload 3 /* buf */
            invokevirtual io.netty.buffer.ByteBuf.release:()Z
            pop
         4: .line 93
            aload 2 /* res */
            aload 2 /* res */
            invokeinterface io.netty.handler.codec.http.FullHttpResponse.content:()Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.readableBytes:()I
            i2l
            invokestatic io.netty.handler.codec.http.HttpUtil.setContentLength:(Lio/netty/handler/codec/http/HttpMessage;J)V
        end local 3 // io.netty.buffer.ByteBuf buf
         5: .line 97
      StackMap locals:
      StackMap stack:
            aload 0 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.channel:()Lio/netty/channel/Channel;
            aload 2 /* res */
            invokeinterface io.netty.channel.Channel.writeAndFlush:(Ljava/lang/Object;)Lio/netty/channel/ChannelFuture;
            astore 3 /* f */
        start local 3 // io.netty.channel.ChannelFuture f
         6: .line 98
            aload 1 /* req */
            invokestatic io.netty.handler.codec.http.HttpUtil.isKeepAlive:(Lio/netty/handler/codec/http/HttpMessage;)Z
            ifeq 7
            aload 2 /* res */
            invokeinterface io.netty.handler.codec.http.FullHttpResponse.status:()Lio/netty/handler/codec/http/HttpResponseStatus;
            invokevirtual io.netty.handler.codec.http.HttpResponseStatus.code:()I
            sipush 200
            if_icmpeq 8
         7: .line 99
      StackMap locals: io.netty.channel.ChannelFuture
      StackMap stack:
            aload 3 /* f */
            getstatic io.netty.channel.ChannelFutureListener.CLOSE:Lio/netty/channel/ChannelFutureListener;
            invokeinterface io.netty.channel.ChannelFuture.addListener:(Lio/netty/util/concurrent/GenericFutureListener;)Lio/netty/channel/ChannelFuture;
            pop
         8: .line 101
      StackMap locals:
      StackMap stack:
            return
        end local 3 // io.netty.channel.ChannelFuture f
        end local 2 // io.netty.handler.codec.http.FullHttpResponse res
        end local 1 // io.netty.handler.codec.http.FullHttpRequest req
        end local 0 // io.netty.channel.ChannelHandlerContext ctx
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0   ctx  Lio/netty/channel/ChannelHandlerContext;
            0    9     1   req  Lio/netty/handler/codec/http/FullHttpRequest;
            0    9     2   res  Lio/netty/handler/codec/http/FullHttpResponse;
            2    5     3   buf  Lio/netty/buffer/ByteBuf;
            6    9     3     f  Lio/netty/channel/ChannelFuture;
    MethodParameters:
      Name  Flags
      ctx   
      req   
      res   

  private static java.lang.String getWebSocketLocation(io.netty.channel.ChannelPipeline, io.netty.handler.codec.http.HttpRequest, java.lang.String);
    descriptor: (Lio/netty/channel/ChannelPipeline;Lio/netty/handler/codec/http/HttpRequest;Ljava/lang/String;)Ljava/lang/String;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // io.netty.channel.ChannelPipeline cp
        start local 1 // io.netty.handler.codec.http.HttpRequest req
        start local 2 // java.lang.String path
         0: .line 104
            ldc "ws"
            astore 3 /* protocol */
        start local 3 // java.lang.String protocol
         1: .line 105
            aload 0 /* cp */
            ldc Lio/netty/handler/ssl/SslHandler;
            invokeinterface io.netty.channel.ChannelPipeline.get:(Ljava/lang/Class;)Lio/netty/channel/ChannelHandler;
            ifnull 3
         2: .line 107
            ldc "wss"
            astore 3 /* protocol */
         3: .line 109
      StackMap locals: java.lang.String
      StackMap stack:
            new java.lang.StringBuilder
            dup
            aload 3 /* protocol */
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc "://"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 1 /* req */
            invokeinterface io.netty.handler.codec.http.HttpRequest.headers:()Lio/netty/handler/codec/http/HttpHeaders;
            getstatic io.netty.handler.codec.http.HttpHeaderNames.HOST:Lio/netty/util/AsciiString;
            invokevirtual io.netty.handler.codec.http.HttpHeaders.get:(Ljava/lang/CharSequence;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 2 /* path */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 3 // java.lang.String protocol
        end local 2 // java.lang.String path
        end local 1 // io.netty.handler.codec.http.HttpRequest req
        end local 0 // io.netty.channel.ChannelPipeline cp
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0        cp  Lio/netty/channel/ChannelPipeline;
            0    4     1       req  Lio/netty/handler/codec/http/HttpRequest;
            0    4     2      path  Ljava/lang/String;
            1    4     3  protocol  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      cp    
      req   
      path  

  protected void channelRead0(io.netty.channel.ChannelHandlerContext, java.lang.Object);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            aload 2
            checkcast io.netty.handler.codec.http.FullHttpRequest
            invokevirtual io.netty.example.http.websocketx.server.WebSocketIndexPageHandler.channelRead0:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/FullHttpRequest;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws java.lang.Exception
}
Signature: Lio/netty/channel/SimpleChannelInboundHandler<Lio/netty/handler/codec/http/FullHttpRequest;>;
SourceFile: "WebSocketIndexPageHandler.java"