On Fri, 2 Nov 2018, [email protected] wrote:
There are some RFCs about Happy-Eyeballs: RFC 8305 which obsoletes RFC 6555.
Firefox doesn't really implement RFC 8305 though, which specifically says:
"Implementations SHOULD NOT wait for both families of answers to return
before attempting connection establishment"
... which thus rules out using a single getaddrinfo() to get both A and AAAA
records.
When doing DNS-over-HTTPS instead, Firefox will at least do the different
resolves separately and *can* act as soon as the first response comes back.
(But will only do so by default if the A entries return first, for practical
reasons.)
Firefox's Happy-Eyeballs is more in the RFC 6555 style.
--
/ daniel.haxx.se
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