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.handler.codec.spdy.SpdyHeaderBlockRawEncoder extends io.netty.handler.codec.spdy.SpdyHeaderBlockEncoder
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder
  super_class: io.netty.handler.codec.spdy.SpdyHeaderBlockEncoder
{
  private final int version;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(io.netty.handler.codec.spdy.SpdyVersion);
    descriptor: (Lio/netty/handler/codec/spdy/SpdyVersion;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder this
        start local 1 // io.netty.handler.codec.spdy.SpdyVersion version
         0: .line 31
            aload 0 /* this */
            invokespecial io.netty.handler.codec.spdy.SpdyHeaderBlockEncoder.<init>:()V
         1: .line 32
            aload 1 /* version */
            ifnonnull 3
         2: .line 33
            new java.lang.NullPointerException
            dup
            ldc "version"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 35
      StackMap locals: io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder io.netty.handler.codec.spdy.SpdyVersion
      StackMap stack:
            aload 0 /* this */
            aload 1 /* version */
            invokevirtual io.netty.handler.codec.spdy.SpdyVersion.getVersion:()I
            putfield io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder.version:I
         4: .line 36
            return
        end local 1 // io.netty.handler.codec.spdy.SpdyVersion version
        end local 0 // io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    5     0     this  Lio/netty/handler/codec/spdy/SpdyHeaderBlockRawEncoder;
            0    5     1  version  Lio/netty/handler/codec/spdy/SpdyVersion;
    MethodParameters:
         Name  Flags
      version  

  private static void setLengthField(io.netty.buffer.ByteBuf, int, int);
    descriptor: (Lio/netty/buffer/ByteBuf;II)V
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // int writerIndex
        start local 2 // int length
         0: .line 39
            aload 0 /* buffer */
            iload 1 /* writerIndex */
            iload 2 /* length */
            invokevirtual io.netty.buffer.ByteBuf.setInt:(II)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 40
            return
        end local 2 // int length
        end local 1 // int writerIndex
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    2     0       buffer  Lio/netty/buffer/ByteBuf;
            0    2     1  writerIndex  I
            0    2     2       length  I
    MethodParameters:
             Name  Flags
      buffer       
      writerIndex  
      length       

  private static void writeLengthField(io.netty.buffer.ByteBuf, int);
    descriptor: (Lio/netty/buffer/ByteBuf;I)V
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // int length
         0: .line 43
            aload 0 /* buffer */
            iload 1 /* length */
            invokevirtual io.netty.buffer.ByteBuf.writeInt:(I)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 44
            return
        end local 1 // int length
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0  buffer  Lio/netty/buffer/ByteBuf;
            0    2     1  length  I
    MethodParameters:
        Name  Flags
      buffer  
      length  

  public io.netty.buffer.ByteBuf encode(io.netty.buffer.ByteBufAllocator, io.netty.handler.codec.spdy.SpdyHeadersFrame);
    descriptor: (Lio/netty/buffer/ByteBufAllocator;Lio/netty/handler/codec/spdy/SpdyHeadersFrame;)Lio/netty/buffer/ByteBuf;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=13, args_size=3
        start local 0 // io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder this
        start local 1 // io.netty.buffer.ByteBufAllocator alloc
        start local 2 // io.netty.handler.codec.spdy.SpdyHeadersFrame frame
         0: .line 48
            aload 2 /* frame */
            invokeinterface io.netty.handler.codec.spdy.SpdyHeadersFrame.headers:()Lio/netty/handler/codec/spdy/SpdyHeaders;
            invokeinterface io.netty.handler.codec.spdy.SpdyHeaders.names:()Ljava/util/Set;
            astore 3 /* names */
        start local 3 // java.util.Set names
         1: .line 49
            aload 3 /* names */
            invokeinterface java.util.Set.size:()I
            istore 4 /* numHeaders */
        start local 4 // int numHeaders
         2: .line 50
            iload 4 /* numHeaders */
            ifne 4
         3: .line 51
            getstatic io.netty.buffer.Unpooled.EMPTY_BUFFER:Lio/netty/buffer/ByteBuf;
            areturn
         4: .line 53
      StackMap locals: java.util.Set int
      StackMap stack:
            iload 4 /* numHeaders */
            ldc 65535
            if_icmple 8
         5: .line 54
            new java.lang.IllegalArgumentException
            dup
         6: .line 55
            ldc "header block contains too many headers"
         7: .line 54
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         8: .line 57
      StackMap locals:
      StackMap stack:
            aload 1 /* alloc */
            invokeinterface io.netty.buffer.ByteBufAllocator.heapBuffer:()Lio/netty/buffer/ByteBuf;
            astore 5 /* headerBlock */
        start local 5 // io.netty.buffer.ByteBuf headerBlock
         9: .line 58
            aload 5 /* headerBlock */
            iload 4 /* numHeaders */
            invokestatic io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder.writeLengthField:(Lio/netty/buffer/ByteBuf;I)V
        10: .line 59
            aload 3 /* names */
            invokeinterface java.util.Set.iterator:()Ljava/util/Iterator;
            astore 7
            goto 34
      StackMap locals: io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder io.netty.buffer.ByteBufAllocator io.netty.handler.codec.spdy.SpdyHeadersFrame java.util.Set int io.netty.buffer.ByteBuf top java.util.Iterator
      StackMap stack:
        11: aload 7
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.CharSequence
            astore 6 /* name */
        start local 6 // java.lang.CharSequence name
        12: .line 60
            aload 5 /* headerBlock */
            aload 6 /* name */
            invokeinterface java.lang.CharSequence.length:()I
            invokestatic io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder.writeLengthField:(Lio/netty/buffer/ByteBuf;I)V
        13: .line 61
            aload 5 /* headerBlock */
            aload 6 /* name */
            invokestatic io.netty.buffer.ByteBufUtil.writeAscii:(Lio/netty/buffer/ByteBuf;Ljava/lang/CharSequence;)I
            pop
        14: .line 62
            aload 5 /* headerBlock */
            invokevirtual io.netty.buffer.ByteBuf.writerIndex:()I
            istore 8 /* savedIndex */
        start local 8 // int savedIndex
        15: .line 63
            iconst_0
            istore 9 /* valueLength */
        start local 9 // int valueLength
        16: .line 64
            aload 5 /* headerBlock */
            iload 9 /* valueLength */
            invokestatic io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder.writeLengthField:(Lio/netty/buffer/ByteBuf;I)V
        17: .line 65
            aload 2 /* frame */
            invokeinterface io.netty.handler.codec.spdy.SpdyHeadersFrame.headers:()Lio/netty/handler/codec/spdy/SpdyHeaders;
            aload 6 /* name */
            invokeinterface io.netty.handler.codec.spdy.SpdyHeaders.getAll:(Ljava/lang/Object;)Ljava/util/List;
            invokeinterface java.util.List.iterator:()Ljava/util/Iterator;
            astore 11
            goto 24
      StackMap locals: io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder io.netty.buffer.ByteBufAllocator io.netty.handler.codec.spdy.SpdyHeadersFrame java.util.Set int io.netty.buffer.ByteBuf java.lang.CharSequence java.util.Iterator int int top java.util.Iterator
      StackMap stack:
        18: aload 11
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.CharSequence
            astore 10 /* value */
        start local 10 // java.lang.CharSequence value
        19: .line 66
            aload 10 /* value */
            invokeinterface java.lang.CharSequence.length:()I
            istore 12 /* length */
        start local 12 // int length
        20: .line 67
            iload 12 /* length */
            ifle 24
        21: .line 68
            aload 5 /* headerBlock */
            aload 10 /* value */
            invokestatic io.netty.buffer.ByteBufUtil.writeAscii:(Lio/netty/buffer/ByteBuf;Ljava/lang/CharSequence;)I
            pop
        22: .line 69
            aload 5 /* headerBlock */
            iconst_0
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        23: .line 70
            iload 9 /* valueLength */
            iload 12 /* length */
            iconst_1
            iadd
            iadd
            istore 9 /* valueLength */
        end local 12 // int length
        end local 10 // java.lang.CharSequence value
        24: .line 65
      StackMap locals:
      StackMap stack:
            aload 11
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 18
        25: .line 73
            iload 9 /* valueLength */
            ifeq 27
        26: .line 74
            iinc 9 /* valueLength */ -1
        27: .line 76
      StackMap locals: io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder io.netty.buffer.ByteBufAllocator io.netty.handler.codec.spdy.SpdyHeadersFrame java.util.Set int io.netty.buffer.ByteBuf java.lang.CharSequence java.util.Iterator int int
      StackMap stack:
            iload 9 /* valueLength */
            ldc 65535
            if_icmple 31
        28: .line 77
            new java.lang.IllegalArgumentException
            dup
        29: .line 78
            new java.lang.StringBuilder
            dup
            ldc "header exceeds allowable length: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 6 /* name */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
        30: .line 77
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        31: .line 80
      StackMap locals:
      StackMap stack:
            iload 9 /* valueLength */
            ifle 34
        32: .line 81
            aload 5 /* headerBlock */
            iload 8 /* savedIndex */
            iload 9 /* valueLength */
            invokestatic io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder.setLengthField:(Lio/netty/buffer/ByteBuf;II)V
        33: .line 82
            aload 5 /* headerBlock */
            aload 5 /* headerBlock */
            invokevirtual io.netty.buffer.ByteBuf.writerIndex:()I
            iconst_1
            isub
            invokevirtual io.netty.buffer.ByteBuf.writerIndex:(I)Lio/netty/buffer/ByteBuf;
            pop
        end local 9 // int valueLength
        end local 8 // int savedIndex
        end local 6 // java.lang.CharSequence name
        34: .line 59
      StackMap locals: io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder io.netty.buffer.ByteBufAllocator io.netty.handler.codec.spdy.SpdyHeadersFrame java.util.Set int io.netty.buffer.ByteBuf top java.util.Iterator
      StackMap stack:
            aload 7
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 11
        35: .line 85
            aload 5 /* headerBlock */
            areturn
        end local 5 // io.netty.buffer.ByteBuf headerBlock
        end local 4 // int numHeaders
        end local 3 // java.util.Set names
        end local 2 // io.netty.handler.codec.spdy.SpdyHeadersFrame frame
        end local 1 // io.netty.buffer.ByteBufAllocator alloc
        end local 0 // io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0   36     0         this  Lio/netty/handler/codec/spdy/SpdyHeaderBlockRawEncoder;
            0   36     1        alloc  Lio/netty/buffer/ByteBufAllocator;
            0   36     2        frame  Lio/netty/handler/codec/spdy/SpdyHeadersFrame;
            1   36     3        names  Ljava/util/Set<Ljava/lang/CharSequence;>;
            2   36     4   numHeaders  I
            9   36     5  headerBlock  Lio/netty/buffer/ByteBuf;
           12   34     6         name  Ljava/lang/CharSequence;
           15   34     8   savedIndex  I
           16   34     9  valueLength  I
           19   24    10        value  Ljava/lang/CharSequence;
           20   24    12       length  I
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
       Name  Flags
      alloc  
      frame  

  void end();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=0, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder this
         0: .line 90
            return
        end local 0 // io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/spdy/SpdyHeaderBlockRawEncoder;
}
SourceFile: "SpdyHeaderBlockRawEncoder.java"