If request wasn't successful CURLINFO_PRIMARY_IP is empty in new versions of curl (in versions of curl several years ago it wasn't empty).
For example in Perl:
-----------
#!/usr/bin/perl
use WWW::Curl::Easy;
$curl = new WWW::Curl::Easy;
$curl->setopt(CURLOPT_URL, "http://curl.haxx.se:12345/");
$curl->setopt(CURLOPT_TIMEOUT, 2);
$curl->perform;
print $curl->getinfo(CURLINFO_PRIMARY_IP);
-----------
In new versions (7.38.0) on Debian 8 we receive empty result. In old versions (7.21.0) on Debian 6 we receive: 151.101.194.49.

Why new versions of curl have empty value in CURLINFO_PRIMARY_IP if request wasn't successful? Is it a bug?
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Received on 2017-05-02