client =
      client.newBuilder()
        .addInterceptor(
          Interceptor { chain: Interceptor.Chain ->
            try {
              chain.proceed(chain.request())
              throw AssertionError()
            } catch (expected: IOException) {
              chain.proceed(chain.request())
            }
          },
        )
        .build()

    val ifNoneMatch = AtomicReference<String?>()
    client =
      client.newBuilder()
        .addNetworkInterceptor(
          Interceptor { chain: Interceptor.Chain ->
            ifNoneMatch.compareAndSet(null, chain.request().header("If-None-Match"))
            chain.proceed(chain.request())
          },
        )
        .build()

    // Confirm the value is cached and intercepted.