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In order for the supervisor to work correctly in IPv6 environments it needs to be RFC 3484 compliant. This RFC is implemented in the operating system and when a hostname resolution is done the results are returned to the application in the order of highest likelihood of succeeding.
NodeJS doesn't respect that order and re-sorts the records. Furthermore, it will only try the first entry and will not continue attempting the rest on failure.
To fix this we need to always pass the
verbatim: true
flag when resolving that was introduced in nodejs 8.5.0 and will become the default in the next major version. See nodejs/node#14731 and nodejs/node#17793