server.enqueue(MockResponse(body = "abc"))
    client =
      client.newBuilder()
        .hostnameVerifier(RecordingHostnameVerifier())
        .connectionSpecs(
          // Attempt RESTRICTED_TLS then fall back to MODERN_TLS.
          listOf(
            ConnectionSpec.RESTRICTED_TLS,
            ConnectionSpec.MODERN_TLS,
          ),
        )
        .sslSocketFactory(