.addHeader("Request-Interceptor", "Android") // 1. Added first.
            .build(),
        )
      originalResponse
        .newBuilder()
        .addHeader("Response-Interceptor", "Donut") // 4. Added last.
        .build()
    }
    addInterceptor(network) { chain: Interceptor.Chain ->
      val originalRequest = chain.request()
      val originalResponse =
        chain.proceed(

            "ETag",
            "v1",
            "Vary",
            "Accept-Charset",
            "Donut",
            "a",
          ),
        body = "A",
      ),
    )
    server.enqueue(
      MockResponse
        .Builder()
        .clearHeaders()
        .addHeader("Donut: b")
        .code(HttpURLConnection.HTTP_NOT_MODIFIED)
        .build(),
    )
    client =