/** Byte 0 reserved flag 3. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV3 = 16

  /** Byte 0 mask for the frame opcode. */
  internal const val B0_MASK_OPCODE = 15

  /** Flag in the opcode which indicates a control frame. */
  internal const val OPCODE_FLAG_CONTROL = 8

  /**
   * Byte 1 flag for whether the payload data is masked.
   *
   * If this flag is set, the next four

    val result = mutableListOf<InetAddress>()

    val buf = Buffer()
    buf.write(byteString)
    buf.readShort() // query id

    val flags = buf.readShort().toInt() and 0xffff
    require(flags shr 15 != 0) { "not a response" }

    val responseCode = flags and 0xf

    if (responseCode == NXDOMAIN) {
      throw UnknownHostException("$hostname: NXDOMAIN")
    } else if (responseCode == SERVFAIL) {

    returned.

 *  Upgrade: [Okio 3.9.0][okio_3_9_0].

 *  Upgrade: [Kotlin 1.9.23][kotlin_1_9_23].

 *  Upgrade: [Unicode® IDNA 15.1.0][idna_15_1_0]


## Version 5.0.0-alpha.12

_2023-12-17_

We took too long to cut this release and there's a lot of changes in it. We've been busy.

    assertThat(response2.header("Warning")).isNull()
  }

  @Test
  fun defaultExpirationDateConditionallyCached() {
    //      last modified: 115 seconds ago
    //             served:  15 seconds ago
    //   default lifetime: (115 - 15) / 10 = 10 seconds
    //            expires:  10 seconds from served date = 5 seconds ago
    val lastModifiedDate = formatDate(-115, TimeUnit.SECONDS)
    val conditionalRequest =

            year = matcher.group(1).toInt()
          }
        }

        pos = dateCharacterOffset(s, end + 1, limit, false)
      }

      // Convert two-digit years into four-digit years. 99 becomes 1999, 15 becomes 2015.
      if (year in 70..99) year += 1900
      if (year in 0..69) year += 2000

      // If any partial is omitted or out of range, return -1. The date is impossible. Note that leap

     </dependency>

     com.squareup.okio:okio:1.13.0
     ```

 *  Fix: gracefully recover when Android 7.0's sockets throw an unexpected
    `NullPointerException`.

## Version 3.7.0

_2017-04-15_

 *  **OkHttp no longer recovers from TLS handshake failures by attempting a TLSv1 connection.**
    The fallback was necessary for servers that implemented version negotiation incorrectly. Now

        addHeaderLenient(headers, header)
        val lowercaseHeader = header.lowercase(Locale.US)
        if (contentLength == -1L && lowercaseHeader.startsWith("content-length:")) {
          contentLength = header.substring(15).trim().toLong()
        }
        if (lowercaseHeader.startsWith("transfer-encoding:") &&
          lowercaseHeader.substring(18).trim() == "chunked"
        ) {
          chunked = true
        }
      }

    assertThat(frameLog(false, 3, 0, TYPE_DATA, FLAG_END_STREAM))
      .isEqualTo(">> 0x00000003     0 DATA          END_STREAM")
    assertThat(frameLog(true, 0, 15, TYPE_SETTINGS, FLAG_NONE))
      .isEqualTo("<< 0x00000000    15 SETTINGS      ")
    assertThat(frameLog(false, 0, 0, TYPE_SETTINGS, FLAG_ACK))
      .isEqualTo(">> 0x00000000     0 SETTINGS      ACK")
    assertThat(frameLog(true, 0, 0, TYPE_SETTINGS, FLAG_ACK))

class PostString {
  private val client = OkHttpClient()

  fun run() {
    val postBody =
      """
      |Releases
      |--------
      |
      | * _1.0_ May 6, 2013
      | * _1.1_ June 15, 2013
      | * _1.2_ August 11, 2013
      |
      """.trimMargin()

    val request =
      Request(
        url = "https://api.github.com/markdown/raw".toHttpUrl(),

  public void run() throws Exception {
    String postBody = ""
        + "Releases\n"
        + "--------\n"
        + "\n"
        + " * _1.0_ May 6, 2013\n"
        + " * _1.1_ June 15, 2013\n"
        + " * _1.2_ August 11, 2013\n";

    Request request = new Request.Builder()
        .url("https://api.github.com/markdown/raw")
        .post(RequestBody.create(postBody, MEDIA_TYPE_MARKDOWN))