assertThat(checkDuration("timeout", 1.milliseconds)).isEqualTo(1)

    assertThat(
      assertThrows<IllegalStateException> {
        checkDuration("timeout", (-1).milliseconds)
      },
    ).hasMessage("timeout < 0")
    assertThat(
      assertThrows<IllegalArgumentException> {
        checkDuration("timeout", 1.nanoseconds)
      },
    ).hasMessage("timeout too small")

    return copy(connectTimeoutMillis = checkDuration("connectTimeout", timeout.toLong(), unit))
  }

  override fun readTimeoutMillis(): Int = readTimeoutMillis

  override fun withReadTimeout(
    timeout: Int,
    unit: TimeUnit,
  ): Interceptor.Chain {
    check(exchange == null) { "Timeouts can't be adjusted in a network interceptor" }

    return copy(readTimeoutMillis = checkDuration("readTimeout", timeout.toLong(), unit))
  }