server.enqueue(
      MockResponse(
        code = 407,
        headers = headersOf("Proxy-Authenticate", "Basic realm=\"localhost\""),
        inTunnel = true,
      ),
    )
    server.enqueue(MockResponse(inTunnel = true))
    server.enqueue(MockResponse(body = "A"))
    client =
      client.newBuilder()
        .proxyAuthenticator(Authenticator.JAVA_NET_AUTHENTICATOR)