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.PerMessageDeflateServerExtensionHandshaker implements io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtensionHandshaker
  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.PerMessageDeflateServerExtensionHandshaker
  super_class: java.lang.Object
{
  public static final int MIN_WINDOW_SIZE;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 8

  public static final int MAX_WINDOW_SIZE;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 15

  static final java.lang.String PERMESSAGE_DEFLATE_EXTENSION;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "permessage-deflate"

  static final java.lang.String CLIENT_MAX_WINDOW;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "client_max_window_bits"

  static final java.lang.String SERVER_MAX_WINDOW;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "server_max_window_bits"

  static final java.lang.String CLIENT_NO_CONTEXT;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "client_no_context_takeover"

  static final java.lang.String SERVER_NO_CONTEXT;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "server_no_context_takeover"

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

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

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

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

  private final boolean preferredClientNoContext;
    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.PerMessageDeflateServerExtensionHandshaker this
         0: .line 54
            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.PerMessageDeflateServerExtensionHandshaker.<init>:(IZIZZ)V
         1: .line 55
            return
        end local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateServerExtensionHandshaker;

  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.PerMessageDeflateServerExtensionHandshaker this
        start local 1 // int compressionLevel
        start local 2 // boolean allowServerWindowSize
        start local 3 // int preferredClientWindowSize
        start local 4 // boolean allowServerNoContext
        start local 5 // boolean preferredClientNoContext
         0: .line 74
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 77
            iload 3 /* preferredClientWindowSize */
            bipush 15
            if_icmpgt 2
            iload 3 /* preferredClientWindowSize */
            bipush 8
            if_icmpge 5
         2: .line 78
      StackMap locals: io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker int int int int int
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
         3: .line 79
            new java.lang.StringBuilder
            dup
            ldc "preferredServerWindowSize: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 3 /* preferredClientWindowSize */
            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 78
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 81
      StackMap locals:
      StackMap stack:
            iload 1 /* compressionLevel */
            iflt 6
            iload 1 /* compressionLevel */
            bipush 9
            if_icmple 9
         6: .line 82
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
         7: .line 83
            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 82
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         9: .line 85
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iload 1 /* compressionLevel */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.compressionLevel:I
        10: .line 86
            aload 0 /* this */
            iload 2 /* allowServerWindowSize */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.allowServerWindowSize:Z
        11: .line 87
            aload 0 /* this */
            iload 3 /* preferredClientWindowSize */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.preferredClientWindowSize:I
        12: .line 88
            aload 0 /* this */
            iload 4 /* allowServerNoContext */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.allowServerNoContext:Z
        13: .line 89
            aload 0 /* this */
            iload 5 /* preferredClientNoContext */
            putfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.preferredClientNoContext:Z
        14: .line 90
            return
        end local 5 // boolean preferredClientNoContext
        end local 4 // boolean allowServerNoContext
        end local 3 // int preferredClientWindowSize
        end local 2 // boolean allowServerWindowSize
        end local 1 // int compressionLevel
        end local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker this
      LocalVariableTable:
        Start  End  Slot                       Name  Signature
            0   15     0                       this  Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateServerExtensionHandshaker;
            0   15     1           compressionLevel  I
            0   15     2      allowServerWindowSize  Z
            0   15     3  preferredClientWindowSize  I
            0   15     4       allowServerNoContext  Z
            0   15     5   preferredClientNoContext  Z
    MethodParameters:
                           Name  Flags
      compressionLevel           
      allowServerWindowSize      
      preferredClientWindowSize  
      allowServerNoContext       
      preferredClientNoContext   

  public io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtension 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/WebSocketServerExtension;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=7, locals=9, args_size=2
        start local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker this
        start local 1 // io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData extensionData
         0: .line 94
            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 95
            aconst_null
            areturn
         2: .line 98
      StackMap locals:
      StackMap stack:
            iconst_1
            istore 2 /* deflateEnabled */
        start local 2 // boolean deflateEnabled
         3: .line 99
            bipush 15
            istore 3 /* clientWindowSize */
        start local 3 // int clientWindowSize
         4: .line 100
            bipush 15
            istore 4 /* serverWindowSize */
        start local 4 // int serverWindowSize
         5: .line 101
            iconst_0
            istore 5 /* serverNoContext */
        start local 5 // boolean serverNoContext
         6: .line 102
            iconst_0
            istore 6 /* clientNoContext */
        start local 6 // boolean clientNoContext
         7: .line 105
            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 104
            astore 7 /* parametersIterator */
        start local 7 // java.util.Iterator parametersIterator
         9: .line 106
            goto 32
        10: .line 107
      StackMap locals: io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker 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 109
            ldc "client_max_window_bits"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 14
        12: .line 111
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.preferredClientWindowSize:I
            istore 3 /* clientWindowSize */
        13: .line 112
            goto 32
      StackMap locals: java.util.Map$Entry
      StackMap stack:
        14: ldc "server_max_window_bits"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 22
        15: .line 114
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.allowServerWindowSize:Z
            ifeq 20
        16: .line 115
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getValue:()Ljava/lang/Object;
            checkcast java.lang.String
            invokestatic java.lang.Integer.parseInt:(Ljava/lang/String;)I
            istore 4 /* serverWindowSize */
        17: .line 116
            iload 4 /* serverWindowSize */
            bipush 15
            if_icmpgt 18
            iload 4 /* serverWindowSize */
            bipush 8
            if_icmpge 32
        18: .line 117
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* deflateEnabled */
        19: .line 119
            goto 32
        20: .line 120
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* deflateEnabled */
        21: .line 122
            goto 32
      StackMap locals:
      StackMap stack:
        22: ldc "client_no_context_takeover"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 25
        23: .line 124
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.preferredClientNoContext:Z
            istore 6 /* clientNoContext */
        24: .line 125
            goto 32
      StackMap locals:
      StackMap stack:
        25: ldc "server_no_context_takeover"
            aload 8 /* parameter */
            invokeinterface java.util.Map$Entry.getKey:()Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 31
        26: .line 127
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.allowServerNoContext:Z
            ifeq 29
        27: .line 128
            iconst_1
            istore 5 /* serverNoContext */
        28: .line 129
            goto 32
        29: .line 130
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* deflateEnabled */
        30: .line 132
            goto 32
        31: .line 134
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 2 /* deflateEnabled */
        end local 8 // java.util.Map$Entry parameter
        32: .line 106
      StackMap locals:
      StackMap stack:
            iload 2 /* deflateEnabled */
            ifeq 33
            aload 7 /* parametersIterator */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 10
        33: .line 138
      StackMap locals:
      StackMap stack:
            iload 2 /* deflateEnabled */
            ifeq 37
        34: .line 139
            new io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker$PermessageDeflateExtension
            dup
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.compressionLevel:I
            iload 5 /* serverNoContext */
        35: .line 140
            iload 4 /* serverWindowSize */
            iload 6 /* clientNoContext */
            iload 3 /* clientWindowSize */
        36: .line 139
            invokespecial io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker$PermessageDeflateExtension.<init>:(IZIZI)V
            areturn
        37: .line 142
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 7 // java.util.Iterator parametersIterator
        end local 6 // boolean clientNoContext
        end local 5 // boolean serverNoContext
        end local 4 // int serverWindowSize
        end local 3 // int clientWindowSize
        end local 2 // boolean deflateEnabled
        end local 1 // io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData extensionData
        end local 0 // io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0   38     0                this  Lio/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateServerExtensionHandshaker;
            0   38     1       extensionData  Lio/netty/handler/codec/http/websocketx/extensions/WebSocketExtensionData;
            3   38     2      deflateEnabled  Z
            4   38     3    clientWindowSize  I
            5   38     4    serverWindowSize  I
            6   38     5     serverNoContext  Z
            7   38     6     clientNoContext  Z
            9   38     7  parametersIterator  Ljava/util/Iterator<Ljava/util/Map$Entry<Ljava/lang/String;Ljava/lang/String;>;>;
           11   32     8           parameter  Ljava/util/Map$Entry<Ljava/lang/String;Ljava/lang/String;>;
    MethodParameters:
               Name  Flags
      extensionData  
}
SourceFile: "PerMessageDeflateServerExtensionHandshaker.java"
NestMembers:
  io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker$PermessageDeflateExtension
InnerClasses:
  private PermessageDeflateExtension = io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker$PermessageDeflateExtension of io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker
  public abstract Entry = java.util.Map$Entry of java.util.Map