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At present, the `direct-download-roaming-network` integration test is a bit odd. It uses the `--retry` switch from `curl` to retry the download once it failed. However, what we want to show with this integration test is that a TCP connection can survive network roaming. We can show that successfully but only if we specify the `--keepalive-time` option, otherwise the download stalls. From inspecting the network logs, this is because `curl` simply waits for more data to be downloaded. After a network reset, the connection however is gone and the _client_ (in this case `curl`) needs to send at least 1 packet to re-establish the connection. By using the keep-alive option, we can send such a packet and the download completes successfully.