}

    /**
     * Returns true if [fieldName] is content specific and therefore should always be used
     * from cached headers.
     */
    private fun isContentSpecificHeader(fieldName: String): Boolean {
      return "Content-Length".equals(fieldName, ignoreCase = true) ||
        "Content-Encoding".equals(fieldName, ignoreCase = true) ||
        "Content-Type".equals(fieldName, ignoreCase = true)
    }
  }
}