return IPv6 by default - Githubissues

got v11 introduced DNS cache as a default behavior by using cacheable-lookup.

Unexpectedly, it breaks http request in some IPv6-only environment where the DNS server support both IPv4 and IPv6.

By default, cacheable-lookup return IPv4 addresses which are unreachable from the server.

With the commonly used library glibc (http://man7.org/linux/man-pages/man3/getaddrinfo.3.html#NOTES), I expect IPv6 addresses without extra configurations in the same situation.

In other words, the following test is expected to be passed.

    {
        const CacheableLookup = mockedInterfaces({has4: false, has6: true});
        const cacheable = new CacheableLookup({resolver, customHostsPath: false});

        verify(t, await cacheable.lookupAsync('localhost'), {
            address: '::ffff:127.0.0.2',
            family: 6
        });
    }

szmarczak / cacheable-lookup

return IPv6 by default #27