private long nextKey = 1;
        private Long peekedKey = null;
        private IOException sendException = null;
        private IOException recvException = null;
        private boolean connectFails = false;
        private boolean disconnectResult = false;

        @Override
        protected long makeKey(Request request) throws IOException {
            return nextKey++;
        }

        @Override

        .build(),
    )
    val call = client.newCall(Request(server.url("/")))
    val response = call.execute()
    assertThat(response.header("a\tb")).isEqualTo("c")
  }

  @Test
  fun connectFails() {
    server.close()
    executeSynchronously("/")
      .assertFailure(IOException::class.java)
  }

  @Test
  fun requestBodySurvivesRetries() {
    server.enqueue(MockResponse())

      .assertLogMatch(Regex("""dnsStart: ${url.host}"""))
      .assertLogMatch(Regex("""callFailed: java.net.UnknownHostException: reason"""))
      .assertNoMoreLogs()
  }

  @Test
  fun connectFail() {
    assumeNotWindows()
    server.useHttps(handshakeCertificates.sslSocketFactory())
    server.protocols = Arrays.asList(Protocol.HTTP_2, Protocol.HTTP_1_1)
    server.enqueue(
      MockResponse

      .assertLogEqual("")
      .assertLogMatch(Regex("""<-- END HTTP \(\d+ms, binary 9-byte body omitted\)"""))
      .assertNoMoreLogs()
  }

  @Test
  fun connectFail() {
    setLevel(Level.BASIC)
    client =
      OkHttpClient
        .Builder()
        .dns { hostname: String? -> throw UnknownHostException("reason") }
        .addInterceptor(applicationInterceptor)