val header = responseHeaders.value(i)

        // Parse each extension.
        var pos = 0
        while (pos < header.length) {
          val extensionEnd = header.delimiterOffset(',', pos)
          val extensionTokenEnd = header.delimiterOffset(';', pos, extensionEnd)
          val extensionToken = header.trimSubstring(pos, extensionTokenEnd)
          pos = extensionTokenEnd + 1

          when {

  ): List<Cookie> {
    val result = mutableListOf<Cookie>()
    var pos = 0
    val limit = header.length
    var pairEnd: Int
    while (pos < limit) {
      pairEnd = header.delimiterOffset(";,", pos, limit)
      val equalsSign = header.delimiterOffset('=', pos, pairEnd)
      val name = header.trimSubstring(pos, equalsSign)
      if (name.startsWith("$")) {
        pos = pairEnd + 1
        continue
      }

    internal fun parse(
      currentTimeMillis: Long,
      url: HttpUrl,
      setCookie: String,
    ): Cookie? {
      val cookiePairEnd = setCookie.delimiterOffset(';')

      val pairEqualsSign = setCookie.delimiterOffset('=', endIndex = cookiePairEnd)
      if (pairEqualsSign == cookiePairEnd) return null

      val cookieName = setCookie.trimSubstring(endIndex = pairEqualsSign)

    get() {
      val pathStart = url.indexOf('/', scheme.length + 3)
      val pathEnd = url.delimiterOffset("?#", pathStart, url.length)
      val result = mutableListOf<String>()
      var i = pathStart
      while (i < pathEnd) {
        i++ // Skip the '/'.
        val segmentEnd = url.delimiterOffset('/', i, pathEnd)
        result.add(url.substring(i, segmentEnd))
        i = segmentEnd
      }

  return substring(start, end)
}

/**
 * Returns the index of the first character in this string that contains a character in
 * [delimiters]. Returns endIndex if there is no such character.
 */
fun String.delimiterOffset(
  delimiters: String,
  startIndex: Int = 0,
  endIndex: Int = length,
): Int {
  for (i in startIndex until endIndex) {
    if (this[i] in delimiters) return i
  }
  return endIndex
}