fun alpnProtocolNames(protocols: List<Protocol>) = protocols.filter { it != Protocol.HTTP_1_0 }.map { it.toString() }

    // This explicit check avoids activating in Android Studio with Android specific classes
    // available when running plugins inside the IDE.
    val isAndroid: Boolean
      get() = "Dalvik" == System.getProperty("java.vm.name")

    private val isConscryptPreferred: Boolean
      get() {

        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")
            }
          }

_2020-08-06_

 *  Fix: Don't crash in `HeldCertificate.Builder` when creating certificates on older versions of
    Android, including Android 6. We were using a feature of `SimpleDateFormat` that wasn't
    available in those versions!


## Version 4.8.0

_2020-07-11_

 *  New: Change `HeldCertificate.Builder` to use its own ASN.1 certificate encoder. This is part

          .protocol(statusLine.protocol)
          .code(statusLine.code)
          .message(statusLine.message)
          .headers(headersReader.readHeaders())
          .trailers { error("trailers not available") }

      return when {
        expectContinue && statusLine.code == HTTP_CONTINUE -> {
          null
        }
        statusLine.code == HTTP_CONTINUE -> {
          state = STATE_READ_RESPONSE_HEADERS

      )
  }

  /**
   * Returns a copy of this connection with the next connection spec to try, or null if no other
   * compatible connection specs are available.
   */
  internal fun nextConnectionSpec(
    connectionSpecs: List<ConnectionSpec>,
    sslSocket: SSLSocket,
  ): ConnectPlan? {
    for (i in connectionSpecIndex + 1 until connectionSpecs.size) {

        ProviderInstaller.installIfNeeded(InstrumentationRegistry.getInstrumentation().targetContext)
      } catch (gpsnae: GooglePlayServicesNotAvailableException) {
        throw TestAbortedException("Google Play Services not available", gpsnae)
      }

      val clientCertificates =
        HandshakeCertificates.Builder()
          .addPlatformTrustedCertificates()
          .addInsecureHost(server.hostName)
          .build()

    localhostIpv6 = inetAddresses.firstOrNull { it is Inet6Address }
      ?: throw TestAbortedException()

    serverIpv4 = MockWebServer()
    serverIpv4.start(localhostIpv4, 0) // Pick any available port.

    serverIpv6 = MockWebServer()
    serverIpv6.start(localhostIpv6, serverIpv4.port) // Pick the same port as the IPv4 server.

    dnsResults =
      listOf(
        localhostIpv4,
        localhostIpv6,

    inetSocketAddress: InetSocketAddress,
    proxy: Proxy,
    protocol: Protocol?,
  ) {
  }

  /**
   * Invoked when a connection attempt fails. This failure is not terminal if further routes are
   * available and failure recovery is enabled.
   *
   * If the `call` uses HTTPS, this will be invoked after [secureConnectStart], otherwise it will
   * invoked after [connectStart].
   */
  open fun connectFailed(

     */
    @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()

    /**

 *         .build())
 *     .url("http://publicobject.com/helloworld.txt")
 *     .build();
 * ```
 *
 * ## Force a Cache Response
 *
 * Sometimes you'll want to show resources if they are available immediately, but not otherwise.
 * This can be used so your application can show *something* while waiting for the latest data to be
 * downloaded. To restrict a request to locally-cached resources, add the `only-if-cached`