RFC describes the caching on page 5 & page 11(Example Algorithm)
https://tools.ietf.org/html/rfc6555#ref-Andrews

2015-07-03 16:25 GMT+08:00 Dan Fandrich <dan_at_coneharvesters.com>:

> On Fri, Jul 03, 2015 at 03:33:40PM +0800, Vincent Chen wrote:
> > 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?
>
> That sounds like reasonable expected behaviour to me. What does the RFC
> have to
> say about this?
>
> >>> Dan
>
> >
> > 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