sorry, I did not make it clear.

At the first time, I connect with a host with Happy Eyeball.
libcurl will try to use ipv6 & ipv4 connection.
If the ipv4 connection is successfully connected.

should libcurl cache ipv4 as the result.
and not to try ipv6 at the second time?

2015-07-03 13:06 GMT+08:00 Dan Fandrich <dan_at_coneharvesters.com>:

> On Fri, Jul 03, 2015 at 10:34:56AM +0800, Vincent Chen wrote:
> > Thanks!
> > now I need to create IPv6 & IPv4 socket for Happy Eyeball.
> >
> > One more question,
> > I found curl doesn't cache successful connection for future uses.
> > Do I need to set any options for Happy Eyeball cache?
>
> curl should cache the connections automatically for future use. Under what
> scenario is that not working for you?
>
> >>> Dan
>
> >
> > 2015-07-02 14:16 GMT+08:00 Dan Fandrich <dan_at_coneharvesters.com>:
> >
> > 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 2015-07-03