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Healthcheck connects to `localhost`, which may resolve to either IPv4 or Ipv6 depending on the platform. However, the server was previously bound to 0.0.0.0, limiting it to IPv4-only. Switching to :: allows the server to listen on both IPv6 and IPv4 when the socket is not restricted with IPV6_V6ONLY, as described in RFC 3493. This improves cross-platform comaptibility and fixes "cargo test" failures in the healthcheck on FreeBSD.