} else if (b != 0) {
      // Group separator ":" delimiter.
      if (input.startsWith(":", startIndex = i)) {
        i++
      } else if (input.startsWith(".", startIndex = i)) {
        // If we see a '.', rewind to the beginning of the previous group and parse as IPv4.
        if (!decodeIpv4Suffix(input, groupOffset, limit, address, b - 2)) return null
        b += 2 // We rewound two bytes and then added four.

            Arrays.fill(buffer, (byte) 0);

            int startIndex = 100;
            request.writeBytesWireFormat(buffer, startIndex);

            // Verify data is at correct position
            for (int i = 0; i < data.length; i++) {
                assertEquals((byte) 0xAB, buffer[startIndex + 48 + i]);
            }
        }

        @Test

   * limits.
   */
  fun encode(string: String): String? {
    var pos = 0
    val limit = string.length
    val result = Buffer()

    while (pos < limit) {
      var dot = string.indexOf('.', startIndex = pos)
      if (dot == -1) dot = limit

      if (!encodeLabel(string, pos, dot, result)) {
        // If we couldn't encode the label, give up.
        return null
      }

      if (dot < limit) {

      if (schemeDelimiterOffset != -1) {
        when {
          input.startsWith("https:", ignoreCase = true, startIndex = pos) -> {
            this.scheme = "https"
            pos += "https:".length
          }
          input.startsWith("http:", ignoreCase = true, startIndex = pos) -> {
            this.scheme = "http"
            pos += "http:".length
          }