* [system DNS service][SYSTEM], which is the default. Some applications may provide their own
 * implementation to use a different DNS server, to prefer IPv6 addresses, to prefer IPv4 addresses,
 * or to force a specific known IP address.
 *
 * Implementations of this interface must be safe for concurrent use.
 */
fun interface Dns {
  /**

    // Write metadata to the end of the file.
    writeMetadata(upstreamSize)
    file!!.channel.force(false)

    // Once everything else is in place we can swap the dirty header for a clean one.
    writeHeader(PREFIX_CLEAN, upstreamSize, metadata.size.toLong())
    file!!.channel.force(false)

    // This file is complete.
    synchronized(this@Relay) {
      complete = true
    }

        val headers = request.headers

        if (requestBody != null) {
          // Request body headers are only present when installed as a network interceptor. When not
          // already present, force them to be included (if available) so their values are known.
          requestBody.contentType()?.let {
            if (headers["Content-Type"] == null) {
              logger.log("Content-Type: $it")
            }

      "FGHIJKLMNOPQRSTUVWXYZ",
    )
    inputStream.close()
    assertContent("ABCDEFGHIJKLMNOPQRSTUVWXYZ", getResponse(newRequest("/")))
  }

  /**
   * We've had a bug where we forget the HTTP response when we see response code 401. This causes a
   * new HTTP request to be issued for every call into the URLConnection.
   */
  @Test
  fun unauthorizedResponseHandling() {
    val mockResponse =

 * doesn't cache partial responses.
 *
 * ## Force a Network Response
 *
 * In some situations, such as after a user clicks a 'refresh' button, it may be necessary to skip
 * the cache, and fetch data directly from the server. To force a full refresh, add the `no-cache`
 * directive:
 *
 * ```java
 * Request request = new Request.Builder()

    var success = false
    try {
      if (connectionSpec.supportsTlsExtensions) {
        Platform.get().configureTlsExtensions(sslSocket, address.url.host, address.protocols)
      }

      // Force handshake. This can throw!
      sslSocket.startHandshake()
      // block for session establishment
      val sslSocketSession = sslSocket.session
      val unverifiedHandshake = sslSocketSession.handshake()

  }

  /**
   * This test puts a request in front of one that is to be canceled, so that it is canceled before
   * I/O takes place.
   */
  @Test
  fun canceledBeforeIOSignalsOnFailure() {
    // Force requests to be executed serially.
    val dispatcher = Dispatcher(client.dispatcher.executorService)
    dispatcher.maxRequests = 1
    client =
      client.newBuilder()
        .dispatcher(dispatcher)

     */
    @JvmField
    val FORCE_NETWORK = commonForceNetwork()

    /**
     * Cache control request directives that uses the cache only, even if the cached response is
     * stale. If the response isn't available in the cache or requires server validation, the call
     * will fail with a `504 Unsatisfiable Request`.
     */
    @JvmField
    val FORCE_CACHE = commonForceCache()

    /**

    val bytes = ByteArray(byteCount)
    Random(0).nextBytes(bytes)
    return ByteString.of(*bytes)
  }

  private fun snapshot(): ByteString {
    randomAccessFile!!.getChannel().force(false)
    val source = file!!.source().buffer()
    return source.readByteString()
  }

  private fun write(data: ByteString) {
    val sink = file!!.sink().buffer()
    sink.write(data)
    sink.close()

    val noTransform: Boolean = cacheControl.noTransform
    val immutable: Boolean = cacheControl.immutable
    val forceCache: CacheControl = CacheControl.FORCE_CACHE
    val forceNetwork: CacheControl = CacheControl.FORCE_NETWORK
    val parse: CacheControl = CacheControl.parse(headersOf())
  }

  @Test
  fun cacheControlBuilder() {
    var builder: CacheControl.Builder = CacheControl.Builder()