override fun source(): BufferedSource = bodySource
  }

  companion object {
    private const val VERSION = 201105
    private const val ENTRY_METADATA = 0
    private const val ENTRY_BODY = 1
    private const val ENTRY_COUNT = 2

    @JvmStatic
    fun key(url: HttpUrl): String = url.toString().encodeUtf8().md5().hex()

    @Throws(IOException::class)