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.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker implements io.netty.handler.codec.http.websocketx.extensions.WebSocketClientExtensionHandshaker
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker
  super_class: java.lang.Object
{
  private final int compressionLevel;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final boolean allowClientWindowSize;
    descriptor: Z
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final int requestedServerWindowSize;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final boolean allowClientNoContext;
    descriptor: Z
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final boolean requestedServerNoContext;
    descriptor: Z
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
         0: .line 48
            aload 0 /* this */
            bipush 6
            invokestatic io.netty.handler.codec.compression.ZlibCodecFactory.isSupportingWindowSizeAndMemLevel:()Z
            bipush 15
            iconst_0
            iconst_0
            invokespecial io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.<init>:(IZIZZ)V
         1: .line 49
            return
        end local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateClientExtensionHandshaker;

  public void <init>(int, boolean, int, boolean, boolean);
    descriptor: (IZIZZ)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=6, args_size=6
        start local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
        start local 1 // int compressionLevel
        start local 2 // boolean allowClientWindowSize
        start local 3 // int requestedServerWindowSize
        start local 4 // boolean allowClientNoContext
        start local 5 // boolean requestedServerNoContext
         0: .line 68
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 71
            iload 3 /* requestedServerWindowSize */
            bipush 15
            if_icmpgt 2
            iload 3 /* requestedServerWindowSize */
            bipush 8
            if_icmpge 5
         2: .line 72
      StackMap locals: io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker int int int int int
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
         3: .line 73
            new java.lang.StringBuilder
            dup
            ldc "requestedServerWindowSize: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 3 /* requestedServerWindowSize */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc " (expected: 8-15)"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         4: .line 72
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 75
      StackMap locals:
      StackMap stack:
            iload 1 /* compressionLevel */
            iflt 6
            iload 1 /* compressionLevel */
            bipush 9
            if_icmple 9
         6: .line 76
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
         7: .line 77
            new java.lang.StringBuilder
            dup
            ldc "compressionLevel: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 1 /* compressionLevel */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc " (expected: 0-9)"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         8: .line 76
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         9: .line 79
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iload 1 /* compressionLevel */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.compressionLevel:I
        10: .line 80
            aload 0 /* this */
            iload 2 /* allowClientWindowSize */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.allowClientWindowSize:Z
        11: .line 81
            aload 0 /* this */
            iload 3 /* requestedServerWindowSize */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerWindowSize:I
        12: .line 82
            aload 0 /* this */
            iload 4 /* allowClientNoContext */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.allowClientNoContext:Z
        13: .line 83
            aload 0 /* this */
            iload 5 /* requestedServerNoContext */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerNoContext:Z
        14: .line 84
            return
        end local 5 // boolean requestedServerNoContext
        end local 4 // boolean allowClientNoContext
        end local 3 // int requestedServerWindowSize
        end local 2 // boolean allowClientWindowSize
        end local 1 // int compressionLevel
        end local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
      LocalVariableTable:
        Start  End  Slot                       Name  Signature
            0   15     0                       this  Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateClientExtensionHandshaker;
            0   15     1           compressionLevel  I
            0   15     2      allowClientWindowSize  Z
            0   15     3  requestedServerWindowSize  I
            0   15     4       allowClientNoContext  Z
            0   15     5   requestedServerNoContext  Z
    MethodParameters:
                           Name  Flags
      compressionLevel           
      allowClientWindowSize      
      requestedServerWindowSize  
      allowClientNoContext       
      requestedServerNoContext   

  public io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData newRequestData();
    descriptor: ()Lio/netty/handler/codec/http/websocketx/extensions/WebSocketExtensionData;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
         0: .line 88
            new java.util.HashMap
            dup
            iconst_4
            invokespecial java.util.HashMap.<init>:(I)V
            astore 1 /* parameters */
        start local 1 // java.util.HashMap parameters
         1: .line 89
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerWindowSize:I
            bipush 15
            if_icmpeq 3
         2: .line 90
            aload 1 /* parameters */
            ldc "server_no_context_takeover"
            aconst_null
            invokevirtual java.util.HashMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         3: .line 92
      StackMap locals: java.util.HashMap
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.allowClientNoContext:Z
            ifeq 5
         4: .line 93
            aload 1 /* parameters */
            ldc "client_no_context_takeover"
            aconst_null
            invokevirtual java.util.HashMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         5: .line 95
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerWindowSize:I
            bipush 15
            if_icmpeq 7
         6: .line 96
            aload 1 /* parameters */
            ldc "server_max_window_bits"
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerWindowSize:I
            invokestatic java.lang.Integer.toString:(I)Ljava/lang/String;
            invokevirtual java.util.HashMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         7: .line 98
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.allowClientWindowSize:Z
            ifeq 9
         8: .line 99
            aload 1 /* parameters */
            ldc "client_max_window_bits"
            aconst_null
            invokevirtual java.util.HashMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         9: .line 101
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData
            dup
            ldc "permessage-deflate"
            aload 1 /* parameters */
            invokespecial io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData.<init>:(Ljava/lang/String;Ljava/util/Map;)V
            areturn
        end local 1 // java.util.HashMap parameters
        end local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   10     0        this  Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateClientExtensionHandshaker;
            1   10     1  parameters  Ljava/util/HashMap<Ljava/lang/String;Ljava/lang/String;>;

  public io.netty.handler.codec.http.websocketx.extensions.WebSocketClientExtension handshakeExtension(io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData);
    descriptor: (Lio/netty/handler/codec/http/websocketx/extensions/WebSocketExtensionData;)Lio/netty/handler/codec/http/websocketx/extensions/WebSocketClientExtension;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=7, locals=9, args_size=2
        start local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
        start local 1 // io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData extensionData
         0: .line 106
            ldc "permessage-deflate"
            aload 1 /* extensionData */
            invokevirtual io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData.name:()Ljava/lang/String;
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 2
         1: .line 107
            aconst_null
            areturn
         2: .line 110
      StackMap locals:
      StackMap stack:
            iconst_1
            istore 2 /* succeed */
        start local 2 // boolean succeed
         3: .line 111
            bipush 15
            istore 3 /* clientWindowSize */
        start local 3 // int clientWindowSize
         4: .line 112
            bipush 15
            istore 4 /* serverWindowSize */
        start local 4 // int serverWindowSize
         5: .line 113
            iconst_0
            istore 5 /* serverNoContext */
        start local 5 // boolean serverNoContext
         6: .line 114
            iconst_0
            istore 6 /* clientNoContext */
        start local 6 // boolean clientNoContext
         7: .line 117
            aload 1 /* extensionData */
            invokevirtual io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData.parameters:()Ljava/util/Map;
            invokeinterface java.util.Map.entrySet:()Ljava/util/Set;
            invokeinterface java.util.Set.iterator:()Ljava/util/Iterator;
         8: .line 116
            astore 7 /* parametersIterator */
        start local 7 // java.util.Iterator parametersIterator
         9: .line 118
            goto 35
        10: .line 119
      StackMap locals: io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData int int int int int java.util.Iterator
      StackMap stack:
            aload 7 /* parametersIterator */
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.util.Map$Entry
            astore 8 /* parameter */
        start local 8 // java.util.Map$Entry parameter
        11: .line 121
            ldc "client_max_window_bits"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 17
        12: .line 123
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.allowClientWindowSize:Z
            ifeq 15
        13: .line 124
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getValue:()Ljava/lang/Object;
            checkcast java.lang.String
            invokestatic java.lang.Integer.parseInt:(Ljava/lang/String;)I
            istore 3 /* clientWindowSize */
        14: .line 125
            goto 35
        15: .line 126
      StackMap locals: java.util.Map$Entry
      StackMap stack:
            iconst_0
            istore 2 /* succeed */
        16: .line 128
            goto 35
      StackMap locals:
      StackMap stack:
        17: ldc "server_max_window_bits"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 22
        18: .line 130
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getValue:()Ljava/lang/Object;
            checkcast java.lang.String
            invokestatic java.lang.Integer.parseInt:(Ljava/lang/String;)I
            istore 4 /* serverWindowSize */
        19: .line 131
            iload 3 /* clientWindowSize */
            bipush 15
            if_icmpgt 20
            iload 3 /* clientWindowSize */
            bipush 8
            if_icmpge 35
        20: .line 132
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* succeed */
        21: .line 134
            goto 35
      StackMap locals:
      StackMap stack:
        22: ldc "client_no_context_takeover"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 28
        23: .line 136
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.allowClientNoContext:Z
            ifeq 26
        24: .line 137
            iconst_1
            istore 6 /* clientNoContext */
        25: .line 138
            goto 35
        26: .line 139
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* succeed */
        27: .line 141
            goto 35
      StackMap locals:
      StackMap stack:
        28: ldc "server_no_context_takeover"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 34
        29: .line 143
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerNoContext:Z
            ifeq 32
        30: .line 144
            iconst_1
            istore 5 /* serverNoContext */
        31: .line 145
            goto 35
        32: .line 146
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* succeed */
        33: .line 148
            goto 35
        34: .line 150
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* succeed */
        end local 8 // java.util.Map$Entry parameter
        35: .line 118
      StackMap locals:
      StackMap stack:
            iload 2 /* succeed */
            ifeq 36
            aload 7 /* parametersIterator */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 10
        36: .line 154
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerNoContext:Z
            ifeq 37
            iload 5 /* serverNoContext */
            ifeq 38
        37: .line 155
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker.requestedServerWindowSize:I
            iload 4 /* serverWindowSize */
            if_icmpeq 39
        38: .line 156
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* succeed */
        39: .line 159
      StackMap locals:
      StackMap stack:
            iload 2 /* succeed */
            ifeq 43
        40: .line 160
            new io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker$PermessageDeflateExtension
            dup
            aload 0 /* this */
            iload 5 /* serverNoContext */
            iload 4 /* serverWindowSize */
        41: .line 161
            iload 6 /* clientNoContext */
            iload 3 /* clientWindowSize */
        42: .line 160
            invokespecial io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker$PermessageDeflateExtension.<init>:(Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateClientExtensionHandshaker;ZIZI)V
            areturn
        43: .line 163
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 7 // java.util.Iterator parametersIterator
        end local 6 // boolean clientNoContext
        end local 5 // boolean serverNoContext
        end local 4 // int serverWindowSize
        end local 3 // int clientWindowSize
        end local 2 // boolean succeed
        end local 1 // io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData extensionData
        end local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0   44     0                this  Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateClientExtensionHandshaker;
            0   44     1       extensionData  Lio/netty/handler/codec/http/websocketx/extensions/WebSocketExtensionData;
            3   44     2             succeed  Z
            4   44     3    clientWindowSize  I
            5   44     4    serverWindowSize  I
            6   44     5     serverNoContext  Z
            7   44     6     clientNoContext  Z
            9   44     7  parametersIterator  Ljava/util/Iterator<Ljava/util/Map$Entry<Ljava/lang/String;Ljava/lang/String;>;>;
           11   35     8           parameter  Ljava/util/Map$Entry<Ljava/lang/String;Ljava/lang/String;>;
    MethodParameters:
               Name  Flags
      extensionData  
}
SourceFile: "PerMessageDeflateClientExtensionHandshaker.java"
NestMembers:
  io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker$PermessageDeflateExtension
InnerClasses:
  private final PermessageDeflateExtension = io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker$PermessageDeflateExtension of io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker
  public abstract Entry = java.util.Map$Entry of java.util.Map