OCLC staff says "We changed the way questionpoint.org DNS resolution
was performed last night and the graceful handling of IPv6 lookups was
inadvertently left off. That has been corrected so please try again.
Roy
>
> ---------- Forwarded message ----------
> From: Jeff Godin <[log in to unmask]>
> Date: Wed, Nov 9, 2011 at 1:18 PM
> Subject: Re: [CODE4LIB] Domain lookup madness
> To: [log in to unmask]
>
>
> On Wed, Nov 9, 2011 at 3:47 PM, Yitzchak Schaffer
> <[log in to unmask]> wrote:
>>
>> yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl
>>
> "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?
> library=10253&rid=0"
>> -m 3 -v
>> * name lookup timed out
>> * Couldn't resolve host 'www.questionpoint.org'
>> * Closing connection #0
>> curl: (6) name lookup timed out
>
> The nameservers for questionpoint.org appear to not respond to queries
> for AAAA records. Expected behavior would be to return an empty
> response.
>
> curl is trying to look up both the A and the AAAA records, and the
> system resolver's timeout is larger than 3 seconds, so curl times out.
> Dropping the -m3 would let curl complete, but it would take about 15
> seconds.
>
> If you pass -4 as an option to curl, this should work around the issue
> by skipping the IPv6 lookup.
>
> If using libcurl in php, you should be able to use the CURL_IPRESOLVE_V4
> option.
>
> I don't know offhand if file_get_contents can be instructed to force
> IPv4.
>
> Another option, since I believe all of the above use the libc resolver
> library -- you can hardcode the IPv4 address in /etc/hosts -- that
> will break when the IP changes.
>
> There are a few other possible workarounds, but hopefully one of the
> above works acceptably.
>
> -jeff
>
>
>
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