https://github.com/square/okhttp/okhttp: An HTTP+HTTP/2 client for Android and Java applications 
public final class okhttp3.Headers$Builder
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: okhttp3.Headers$Builder
  super_class: java.lang.Object
{
  final java.util.List<java.lang.String> namesAndValues;
    descriptor: Ljava/util/List;
    flags: (0x0010) ACC_FINAL
    Signature: Ljava/util/List<Ljava/lang/String;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // okhttp3.Headers$Builder this
         0: .line 278
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 279
            aload 0 /* this */
            new java.util.ArrayList
            dup
            bipush 20
            invokespecial java.util.ArrayList.<init>:(I)V
            putfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
         2: .line 278
            return
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lokhttp3/Headers$Builder;

  okhttp3.Headers$Builder addLenient(java.lang.String);
    descriptor: (Ljava/lang/String;)Lokhttp3/Headers$Builder;
    flags: (0x0000) 
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String line
         0: .line 286
            aload 1 /* line */
            ldc ":"
            iconst_1
            invokevirtual java.lang.String.indexOf:(Ljava/lang/String;I)I
            istore 2 /* index */
        start local 2 // int index
         1: .line 287
            iload 2 /* index */
            iconst_m1
            if_icmpeq 3
         2: .line 288
            aload 0 /* this */
            aload 1 /* line */
            iconst_0
            iload 2 /* index */
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            aload 1 /* line */
            iload 2 /* index */
            iconst_1
            iadd
            invokevirtual java.lang.String.substring:(I)Ljava/lang/String;
            invokevirtual okhttp3.Headers$Builder.addLenient:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            areturn
         3: .line 289
      StackMap locals: int
      StackMap stack:
            aload 1 /* line */
            ldc ":"
            invokevirtual java.lang.String.startsWith:(Ljava/lang/String;)Z
            ifeq 5
         4: .line 292
            aload 0 /* this */
            ldc ""
            aload 1 /* line */
            iconst_1
            invokevirtual java.lang.String.substring:(I)Ljava/lang/String;
            invokevirtual okhttp3.Headers$Builder.addLenient:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            areturn
         5: .line 294
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            ldc ""
            aload 1 /* line */
            invokevirtual okhttp3.Headers$Builder.addLenient:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            areturn
        end local 2 // int index
        end local 1 // java.lang.String line
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    6     0   this  Lokhttp3/Headers$Builder;
            0    6     1   line  Ljava/lang/String;
            1    6     2  index  I
    MethodParameters:
      Name  Flags
      line  

  public okhttp3.Headers$Builder add(java.lang.String);
    descriptor: (Ljava/lang/String;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String line
         0: .line 300
            aload 1 /* line */
            ldc ":"
            invokevirtual java.lang.String.indexOf:(Ljava/lang/String;)I
            istore 2 /* index */
        start local 2 // int index
         1: .line 301
            iload 2 /* index */
            iconst_m1
            if_icmpne 3
         2: .line 302
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Unexpected header: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 1 /* line */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 304
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* line */
            iconst_0
            iload 2 /* index */
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokevirtual java.lang.String.trim:()Ljava/lang/String;
            aload 1 /* line */
            iload 2 /* index */
            iconst_1
            iadd
            invokevirtual java.lang.String.substring:(I)Ljava/lang/String;
            invokevirtual okhttp3.Headers$Builder.add:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            areturn
        end local 2 // int index
        end local 1 // java.lang.String line
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lokhttp3/Headers$Builder;
            0    4     1   line  Ljava/lang/String;
            1    4     2  index  I
    MethodParameters:
      Name  Flags
      line  

  public okhttp3.Headers$Builder add(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
        start local 2 // java.lang.String value
         0: .line 311
            aload 1 /* name */
            invokestatic okhttp3.Headers.checkName:(Ljava/lang/String;)V
         1: .line 312
            aload 2 /* value */
            aload 1 /* name */
            invokestatic okhttp3.Headers.checkValue:(Ljava/lang/String;Ljava/lang/String;)V
         2: .line 313
            aload 0 /* this */
            aload 1 /* name */
            aload 2 /* value */
            invokevirtual okhttp3.Headers$Builder.addLenient:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            areturn
        end local 2 // java.lang.String value
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lokhttp3/Headers$Builder;
            0    3     1   name  Ljava/lang/String;
            0    3     2  value  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      name   
      value  

  public okhttp3.Headers$Builder addUnsafeNonAscii(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
        start local 2 // java.lang.String value
         0: .line 321
            aload 1 /* name */
            invokestatic okhttp3.Headers.checkName:(Ljava/lang/String;)V
         1: .line 322
            aload 0 /* this */
            aload 1 /* name */
            aload 2 /* value */
            invokevirtual okhttp3.Headers$Builder.addLenient:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            areturn
        end local 2 // java.lang.String value
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lokhttp3/Headers$Builder;
            0    2     1   name  Ljava/lang/String;
            0    2     2  value  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      name   
      value  

  public okhttp3.Headers$Builder addAll(okhttp3.Headers);
    descriptor: (Lokhttp3/Headers;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=2
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // okhttp3.Headers headers
         0: .line 329
            aload 1 /* headers */
            invokevirtual okhttp3.Headers.size:()I
            istore 2 /* size */
        start local 2 // int size
         1: .line 330
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         2: goto 5
         3: .line 331
      StackMap locals: int int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* headers */
            iload 3 /* i */
            invokevirtual okhttp3.Headers.name:(I)Ljava/lang/String;
            aload 1 /* headers */
            iload 3 /* i */
            invokevirtual okhttp3.Headers.value:(I)Ljava/lang/String;
            invokevirtual okhttp3.Headers$Builder.addLenient:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            pop
         4: .line 330
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         5: iload 3 /* i */
            iload 2 /* size */
            if_icmplt 3
        end local 3 // int i
         6: .line 334
            aload 0 /* this */
            areturn
        end local 2 // int size
        end local 1 // okhttp3.Headers headers
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    7     0     this  Lokhttp3/Headers$Builder;
            0    7     1  headers  Lokhttp3/Headers;
            1    7     2     size  I
            2    6     3        i  I
    MethodParameters:
         Name  Flags
      headers  

  public okhttp3.Headers$Builder add(java.lang.String, java.util.Date);
    descriptor: (Ljava/lang/String;Ljava/util/Date;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
        start local 2 // java.util.Date value
         0: .line 342
            aload 2 /* value */
            ifnonnull 1
            new java.lang.NullPointerException
            dup
            new java.lang.StringBuilder
            dup
            ldc "value for name "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 1 /* name */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " == null"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         1: .line 343
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* name */
            aload 2 /* value */
            invokestatic okhttp3.internal.http.HttpDate.format:(Ljava/util/Date;)Ljava/lang/String;
            invokevirtual okhttp3.Headers$Builder.add:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            pop
         2: .line 344
            aload 0 /* this */
            areturn
        end local 2 // java.util.Date value
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lokhttp3/Headers$Builder;
            0    3     1   name  Ljava/lang/String;
            0    3     2  value  Ljava/util/Date;
    MethodParameters:
       Name  Flags
      name   
      value  

  public okhttp3.Headers$Builder set(java.lang.String, java.util.Date);
    descriptor: (Ljava/lang/String;Ljava/util/Date;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
        start local 2 // java.util.Date value
         0: .line 352
            aload 2 /* value */
            ifnonnull 1
            new java.lang.NullPointerException
            dup
            new java.lang.StringBuilder
            dup
            ldc "value for name "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 1 /* name */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " == null"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         1: .line 353
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* name */
            aload 2 /* value */
            invokestatic okhttp3.internal.http.HttpDate.format:(Ljava/util/Date;)Ljava/lang/String;
            invokevirtual okhttp3.Headers$Builder.set:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            pop
         2: .line 354
            aload 0 /* this */
            areturn
        end local 2 // java.util.Date value
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lokhttp3/Headers$Builder;
            0    3     1   name  Ljava/lang/String;
            0    3     2  value  Ljava/util/Date;
    MethodParameters:
       Name  Flags
      name   
      value  

  okhttp3.Headers$Builder addLenient(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
        start local 2 // java.lang.String value
         0: .line 362
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            aload 1 /* name */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         1: .line 363
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            aload 2 /* value */
            invokevirtual java.lang.String.trim:()Ljava/lang/String;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         2: .line 364
            aload 0 /* this */
            areturn
        end local 2 // java.lang.String value
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lokhttp3/Headers$Builder;
            0    3     1   name  Ljava/lang/String;
            0    3     2  value  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      name   
      value  

  public okhttp3.Headers$Builder removeAll(java.lang.String);
    descriptor: (Ljava/lang/String;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
         0: .line 368
            iconst_0
            istore 2 /* i */
        start local 2 // int i
         1: goto 7
         2: .line 369
      StackMap locals: int
      StackMap stack:
            aload 1 /* name */
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            iload 2 /* i */
            invokeinterface java.util.List.get:(I)Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 6
         3: .line 370
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            iload 2 /* i */
            invokeinterface java.util.List.remove:(I)Ljava/lang/Object;
            pop
         4: .line 371
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            iload 2 /* i */
            invokeinterface java.util.List.remove:(I)Ljava/lang/Object;
            pop
         5: .line 372
            iinc 2 /* i */ -2
         6: .line 368
      StackMap locals:
      StackMap stack:
            iinc 2 /* i */ 2
      StackMap locals:
      StackMap stack:
         7: iload 2 /* i */
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            invokeinterface java.util.List.size:()I
            if_icmplt 2
        end local 2 // int i
         8: .line 375
            aload 0 /* this */
            areturn
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lokhttp3/Headers$Builder;
            0    9     1  name  Ljava/lang/String;
            1    8     2     i  I
    MethodParameters:
      Name  Flags
      name  

  public okhttp3.Headers$Builder set(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
        start local 2 // java.lang.String value
         0: .line 383
            aload 1 /* name */
            invokestatic okhttp3.Headers.checkName:(Ljava/lang/String;)V
         1: .line 384
            aload 2 /* value */
            aload 1 /* name */
            invokestatic okhttp3.Headers.checkValue:(Ljava/lang/String;Ljava/lang/String;)V
         2: .line 385
            aload 0 /* this */
            aload 1 /* name */
            invokevirtual okhttp3.Headers$Builder.removeAll:(Ljava/lang/String;)Lokhttp3/Headers$Builder;
            pop
         3: .line 386
            aload 0 /* this */
            aload 1 /* name */
            aload 2 /* value */
            invokevirtual okhttp3.Headers$Builder.addLenient:(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Headers$Builder;
            pop
         4: .line 387
            aload 0 /* this */
            areturn
        end local 2 // java.lang.String value
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    5     0   this  Lokhttp3/Headers$Builder;
            0    5     1   name  Ljava/lang/String;
            0    5     2  value  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      name   
      value  

  public java.lang.String get(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // okhttp3.Headers$Builder this
        start local 1 // java.lang.String name
         0: .line 392
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            invokeinterface java.util.List.size:()I
            iconst_2
            isub
            istore 2 /* i */
        start local 2 // int i
         1: goto 5
         2: .line 393
      StackMap locals: int
      StackMap stack:
            aload 1 /* name */
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            iload 2 /* i */
            invokeinterface java.util.List.get:(I)Ljava/lang/Object;
            checkcast java.lang.String
            invokevirtual java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z
            ifeq 4
         3: .line 394
            aload 0 /* this */
            getfield okhttp3.Headers$Builder.namesAndValues:Ljava/util/List;
            iload 2 /* i */
            iconst_1
            iadd
            invokeinterface java.util.List.get:(I)Ljava/lang/Object;
            checkcast java.lang.String
            areturn
         4: .line 392
      StackMap locals:
      StackMap stack:
            iinc 2 /* i */ -2
      StackMap locals:
      StackMap stack:
         5: iload 2 /* i */
            ifge 2
        end local 2 // int i
         6: .line 397
            aconst_null
            areturn
        end local 1 // java.lang.String name
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lokhttp3/Headers$Builder;
            0    7     1  name  Ljava/lang/String;
            1    6     2     i  I
    MethodParameters:
      Name  Flags
      name  

  public okhttp3.Headers build();
    descriptor: ()Lokhttp3/Headers;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // okhttp3.Headers$Builder this
         0: .line 401
            new okhttp3.Headers
            dup
            aload 0 /* this */
            invokespecial okhttp3.Headers.<init>:(Lokhttp3/Headers$Builder;)V
            areturn
        end local 0 // okhttp3.Headers$Builder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lokhttp3/Headers$Builder;
}
SourceFile: "Headers.java"
NestHost: okhttp3.Headers
InnerClasses:
  public final Builder = okhttp3.Headers$Builder of okhttp3.Headers