On Thu, Jul 02, 2015 at 09:59:05AM +0800, Vincent Chen wrote:
> I'm developing a HTTP client with multi interface and have some questions when
> domain name look up has both IPv6 & IPv4 address
>
> [Question1]
> I implement the opensocket call back to create socket by myself and monitor
> socket event.
>
> and found the callback will be called twice.
>
> First callback is for IPv6 and the second callback is for IPv4.

This behaviour is called "Happy Eyeballs" and is covered by RFC6555.

>>> Dan
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Received on 2015-07-02