[problem]
You notice for some hosts curl and/or libcurl are taking 7 or so secs to lookup the host. But nslookup or dig respond almost immediately.
[/problem]
[solution]
Try doing curl -4 -w “time_namelookup: %{time_namelookup}n” …. and try without the -4. If you see drastic differences, you could be falling foul of the IPV6 bug. To work around this, you can either just use -4 with curl or set CURLOPT_IPRESOLVE with libcurl.
[/solution]
[example]
I spents hours and hours and hours, trying to get this working with libcurl and perl. It turned out I need to upgrade to WWW::Curl::Easy version 3.0 – as opposed to version 2. Do a search on search.cpan.org for Curl and it will tell you how to check your version.
Then if you like me upgrade, you need to also modify all your code from: Curl::easy::setopt($curl, … to $curl->setopt( …
[/example]
[tags]libcurl, resolve, namelookup[/tags]
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