https://tomcat.apache.org/: Tomcat Connectors and HTTP parser 
public class org.apache.tomcat.util.http.RequestUtil
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.tomcat.util.http.RequestUtil
  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 // org.apache.tomcat.util.http.RequestUtil this
         0: .line 21
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 23
            return
        end local 0 // org.apache.tomcat.util.http.RequestUtil this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/tomcat/util/http/RequestUtil;

  public static java.lang.String normalize(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // java.lang.String path
         0: .line 38
            aload 0 /* path */
            iconst_1
            invokestatic org.apache.tomcat.util.http.RequestUtil.normalize:(Ljava/lang/String;Z)Ljava/lang/String;
            areturn
        end local 0 // java.lang.String path
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  path  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      path  

  public static java.lang.String normalize(java.lang.String, boolean);
    descriptor: (Ljava/lang/String;Z)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=6, args_size=2
        start local 0 // java.lang.String path
        start local 1 // boolean replaceBackSlash
         0: .line 56
            aload 0 /* path */
            ifnonnull 2
         1: .line 57
            aconst_null
            areturn
         2: .line 61
      StackMap locals:
      StackMap stack:
            aload 0 /* path */
            astore 2 /* normalized */
        start local 2 // java.lang.String normalized
         3: .line 63
            iload 1 /* replaceBackSlash */
            ifeq 5
            aload 2 /* normalized */
            bipush 92
            invokevirtual java.lang.String.indexOf:(I)I
            iflt 5
         4: .line 64
            aload 2 /* normalized */
            bipush 92
            bipush 47
            invokevirtual java.lang.String.replace:(CC)Ljava/lang/String;
            astore 2 /* normalized */
         5: .line 67
      StackMap locals: java.lang.String
      StackMap stack:
            aload 2 /* normalized */
            ldc "/"
            invokevirtual java.lang.String.startsWith:(Ljava/lang/String;)Z
            ifne 7
         6: .line 68
            new java.lang.StringBuilder
            dup
            ldc "/"
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* normalized */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            astore 2 /* normalized */
         7: .line 70
      StackMap locals:
      StackMap stack:
            iconst_0
            istore 3 /* addedTrailingSlash */
        start local 3 // boolean addedTrailingSlash
         8: .line 71
            aload 2 /* normalized */
            ldc "/."
            invokevirtual java.lang.String.endsWith:(Ljava/lang/String;)Z
            ifne 9
            aload 2 /* normalized */
            ldc "/.."
            invokevirtual java.lang.String.endsWith:(Ljava/lang/String;)Z
            ifeq 11
         9: .line 72
      StackMap locals: int
      StackMap stack:
            new java.lang.StringBuilder
            dup
            aload 2 /* normalized */
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc "/"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            astore 2 /* normalized */
        10: .line 73
            iconst_1
            istore 3 /* addedTrailingSlash */
        11: .line 78
      StackMap locals:
      StackMap stack:
            aload 2 /* normalized */
            ldc "//"
            invokevirtual java.lang.String.indexOf:(Ljava/lang/String;)I
            istore 4 /* index */
        start local 4 // int index
        12: .line 79
            iload 4 /* index */
            ifge 14
        13: .line 80
            goto 16
        14: .line 82
      StackMap locals: int
      StackMap stack:
            new java.lang.StringBuilder
            dup
            aload 2 /* normalized */
            iconst_0
            iload 4 /* index */
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* normalized */
            iload 4 /* index */
            iconst_1
            iadd
            invokevirtual java.lang.String.substring:(I)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            astore 2 /* normalized */
        end local 4 // int index
        15: .line 77
            goto 11
        16: .line 87
      StackMap locals:
      StackMap stack:
            aload 2 /* normalized */
            ldc "/./"
            invokevirtual java.lang.String.indexOf:(Ljava/lang/String;)I
            istore 4 /* index */
        start local 4 // int index
        17: .line 88
            iload 4 /* index */
            ifge 19
        18: .line 89
            goto 21
        19: .line 91
      StackMap locals: int
      StackMap stack:
            new java.lang.StringBuilder
            dup
            aload 2 /* normalized */
            iconst_0
            iload 4 /* index */
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* normalized */
            iload 4 /* index */
            iconst_2
            iadd
            invokevirtual java.lang.String.substring:(I)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            astore 2 /* normalized */
        end local 4 // int index
        20: .line 86
            goto 16
        21: .line 96
      StackMap locals:
      StackMap stack:
            aload 2 /* normalized */
            ldc "/../"
            invokevirtual java.lang.String.indexOf:(Ljava/lang/String;)I
            istore 4 /* index */
        start local 4 // int index
        22: .line 97
            iload 4 /* index */
            ifge 24
        23: .line 98
            goto 29
        24: .line 100
      StackMap locals: int
      StackMap stack:
            iload 4 /* index */
            ifne 26
        25: .line 101
            aconst_null
            areturn
        26: .line 103
      StackMap locals:
      StackMap stack:
            aload 2 /* normalized */
            bipush 47
            iload 4 /* index */
            iconst_1
            isub
            invokevirtual java.lang.String.lastIndexOf:(II)I
            istore 5 /* index2 */
        start local 5 // int index2
        27: .line 104
            new java.lang.StringBuilder
            dup
            aload 2 /* normalized */
            iconst_0
            iload 5 /* index2 */
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* normalized */
            iload 4 /* index */
            iconst_3
            iadd
            invokevirtual java.lang.String.substring:(I)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            astore 2 /* normalized */
        end local 5 // int index2
        end local 4 // int index
        28: .line 95
            goto 21
        29: .line 107
      StackMap locals:
      StackMap stack:
            aload 2 /* normalized */
            invokevirtual java.lang.String.length:()I
            iconst_1
            if_icmple 31
            iload 3 /* addedTrailingSlash */
            ifeq 31
        30: .line 110
            aload 2 /* normalized */
            iconst_0
            aload 2 /* normalized */
            invokevirtual java.lang.String.length:()I
            iconst_1
            isub
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            astore 2 /* normalized */
        31: .line 114
      StackMap locals:
      StackMap stack:
            aload 2 /* normalized */
            areturn
        end local 3 // boolean addedTrailingSlash
        end local 2 // java.lang.String normalized
        end local 1 // boolean replaceBackSlash
        end local 0 // java.lang.String path
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0   32     0                path  Ljava/lang/String;
            0   32     1    replaceBackSlash  Z
            3   32     2          normalized  Ljava/lang/String;
            8   32     3  addedTrailingSlash  Z
           12   15     4               index  I
           17   20     4               index  I
           22   28     4               index  I
           27   28     5              index2  I
    MethodParameters:
                  Name  Flags
      path              
      replaceBackSlash  
}
SourceFile: "RequestUtil.java"