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.WebSocketClientHandshakerFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory
  super_class: java.lang.Object
{
  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.websocketx.WebSocketClientHandshakerFactory this
         0: .line 32
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 33
            return
        end local 0 // io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory;

  public static io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker newHandshaker(java.net.URI, io.netty.handler.codec.http.websocketx.WebSocketVersion, java.lang.String, boolean, io.netty.handler.codec.http.HttpHeaders);
    descriptor: (Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;)Lio/netty/handler/codec/http/websocketx/WebSocketClientHandshaker;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=6, locals=5, args_size=5
        start local 0 // java.net.URI webSocketURL
        start local 1 // io.netty.handler.codec.http.websocketx.WebSocketVersion version
        start local 2 // java.lang.String subprotocol
        start local 3 // boolean allowExtensions
        start local 4 // io.netty.handler.codec.http.HttpHeaders customHeaders
         0: .line 53
            aload 0 /* webSocketURL */
            aload 1 /* version */
            aload 2 /* subprotocol */
            iload 3 /* allowExtensions */
            aload 4 /* customHeaders */
            ldc 65536
            invokestatic io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory.newHandshaker:(Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;I)Lio/netty/handler/codec/http/websocketx/WebSocketClientHandshaker;
            areturn
        end local 4 // io.netty.handler.codec.http.HttpHeaders customHeaders
        end local 3 // boolean allowExtensions
        end local 2 // java.lang.String subprotocol
        end local 1 // io.netty.handler.codec.http.websocketx.WebSocketVersion version
        end local 0 // java.net.URI webSocketURL
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    1     0     webSocketURL  Ljava/net/URI;
            0    1     1          version  Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            0    1     2      subprotocol  Ljava/lang/String;
            0    1     3  allowExtensions  Z
            0    1     4    customHeaders  Lio/netty/handler/codec/http/HttpHeaders;
    MethodParameters:
                 Name  Flags
      webSocketURL     
      version          
      subprotocol      
      allowExtensions  
      customHeaders    

  public static io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker newHandshaker(java.net.URI, io.netty.handler.codec.http.websocketx.WebSocketVersion, java.lang.String, boolean, io.netty.handler.codec.http.HttpHeaders, int);
    descriptor: (Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;I)Lio/netty/handler/codec/http/websocketx/WebSocketClientHandshaker;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=8, locals=6, args_size=6
        start local 0 // java.net.URI webSocketURL
        start local 1 // io.netty.handler.codec.http.websocketx.WebSocketVersion version
        start local 2 // java.lang.String subprotocol
        start local 3 // boolean allowExtensions
        start local 4 // io.netty.handler.codec.http.HttpHeaders customHeaders
        start local 5 // int maxFramePayloadLength
         0: .line 77
            aload 0 /* webSocketURL */
            aload 1 /* version */
            aload 2 /* subprotocol */
            iload 3 /* allowExtensions */
            aload 4 /* customHeaders */
         1: .line 78
            iload 5 /* maxFramePayloadLength */
            iconst_1
            iconst_0
         2: .line 77
            invokestatic io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory.newHandshaker:(Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;IZZ)Lio/netty/handler/codec/http/websocketx/WebSocketClientHandshaker;
            areturn
        end local 5 // int maxFramePayloadLength
        end local 4 // io.netty.handler.codec.http.HttpHeaders customHeaders
        end local 3 // boolean allowExtensions
        end local 2 // java.lang.String subprotocol
        end local 1 // io.netty.handler.codec.http.websocketx.WebSocketVersion version
        end local 0 // java.net.URI webSocketURL
      LocalVariableTable:
        Start  End  Slot                   Name  Signature
            0    3     0           webSocketURL  Ljava/net/URI;
            0    3     1                version  Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            0    3     2            subprotocol  Ljava/lang/String;
            0    3     3        allowExtensions  Z
            0    3     4          customHeaders  Lio/netty/handler/codec/http/HttpHeaders;
            0    3     5  maxFramePayloadLength  I
    MethodParameters:
                       Name  Flags
      webSocketURL           
      version                
      subprotocol            
      allowExtensions        
      customHeaders          
      maxFramePayloadLength  

  public static io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker newHandshaker(java.net.URI, io.netty.handler.codec.http.websocketx.WebSocketVersion, java.lang.String, boolean, io.netty.handler.codec.http.HttpHeaders, int, boolean, boolean);
    descriptor: (Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;IZZ)Lio/netty/handler/codec/http/websocketx/WebSocketClientHandshaker;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=10, locals=8, args_size=8
        start local 0 // java.net.URI webSocketURL
        start local 1 // io.netty.handler.codec.http.websocketx.WebSocketVersion version
        start local 2 // java.lang.String subprotocol
        start local 3 // boolean allowExtensions
        start local 4 // io.netty.handler.codec.http.HttpHeaders customHeaders
        start local 5 // int maxFramePayloadLength
        start local 6 // boolean performMasking
        start local 7 // boolean allowMaskMismatch
         0: .line 110
            aload 1 /* version */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V13:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            if_acmpne 5
         1: .line 111
            new io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker13
            dup
         2: .line 112
            aload 0 /* webSocketURL */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V13:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            aload 2 /* subprotocol */
            iload 3 /* allowExtensions */
            aload 4 /* customHeaders */
         3: .line 113
            iload 5 /* maxFramePayloadLength */
            iload 6 /* performMasking */
            iload 7 /* allowMaskMismatch */
         4: .line 111
            invokespecial io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker13.<init>:(Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;IZZ)V
            areturn
         5: .line 115
      StackMap locals:
      StackMap stack:
            aload 1 /* version */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V08:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            if_acmpne 10
         6: .line 116
            new io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker08
            dup
         7: .line 117
            aload 0 /* webSocketURL */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V08:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            aload 2 /* subprotocol */
            iload 3 /* allowExtensions */
            aload 4 /* customHeaders */
         8: .line 118
            iload 5 /* maxFramePayloadLength */
            iload 6 /* performMasking */
            iload 7 /* allowMaskMismatch */
         9: .line 116
            invokespecial io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker08.<init>:(Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;IZZ)V
            areturn
        10: .line 120
      StackMap locals:
      StackMap stack:
            aload 1 /* version */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V07:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            if_acmpne 15
        11: .line 121
            new io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker07
            dup
        12: .line 122
            aload 0 /* webSocketURL */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V07:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            aload 2 /* subprotocol */
            iload 3 /* allowExtensions */
            aload 4 /* customHeaders */
        13: .line 123
            iload 5 /* maxFramePayloadLength */
            iload 6 /* performMasking */
            iload 7 /* allowMaskMismatch */
        14: .line 121
            invokespecial io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker07.<init>:(Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;ZLio/netty/handler/codec/http/HttpHeaders;IZZ)V
            areturn
        15: .line 125
      StackMap locals:
      StackMap stack:
            aload 1 /* version */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V00:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            if_acmpne 19
        16: .line 126
            new io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker00
            dup
        17: .line 127
            aload 0 /* webSocketURL */
            getstatic io.netty.handler.codec.http.websocketx.WebSocketVersion.V00:Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            aload 2 /* subprotocol */
            aload 4 /* customHeaders */
            iload 5 /* maxFramePayloadLength */
        18: .line 126
            invokespecial io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker00.<init>:(Ljava/net/URI;Lio/netty/handler/codec/http/websocketx/WebSocketVersion;Ljava/lang/String;Lio/netty/handler/codec/http/HttpHeaders;I)V
            areturn
        19: .line 130
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.http.websocketx.WebSocketHandshakeException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Protocol version "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 1 /* version */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc " not supported."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial io.netty.handler.codec.http.websocketx.WebSocketHandshakeException.<init>:(Ljava/lang/String;)V
            athrow
        end local 7 // boolean allowMaskMismatch
        end local 6 // boolean performMasking
        end local 5 // int maxFramePayloadLength
        end local 4 // io.netty.handler.codec.http.HttpHeaders customHeaders
        end local 3 // boolean allowExtensions
        end local 2 // java.lang.String subprotocol
        end local 1 // io.netty.handler.codec.http.websocketx.WebSocketVersion version
        end local 0 // java.net.URI webSocketURL
      LocalVariableTable:
        Start  End  Slot                   Name  Signature
            0   20     0           webSocketURL  Ljava/net/URI;
            0   20     1                version  Lio/netty/handler/codec/http/websocketx/WebSocketVersion;
            0   20     2            subprotocol  Ljava/lang/String;
            0   20     3        allowExtensions  Z
            0   20     4          customHeaders  Lio/netty/handler/codec/http/HttpHeaders;
            0   20     5  maxFramePayloadLength  I
            0   20     6         performMasking  Z
            0   20     7      allowMaskMismatch  Z
    MethodParameters:
                       Name  Flags
      webSocketURL           
      version                
      subprotocol            
      allowExtensions        
      customHeaders          
      maxFramePayloadLength  
      performMasking         
      allowMaskMismatch      
}
SourceFile: "WebSocketClientHandshakerFactory.java"