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500 Can't connect to search.cpan.org:80 (Bad hostname 'search.cpan.org')
'client-warning' => 'Internal response',
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strace perl -e 'gethostbyname "bahn.de"' 2>&1 | grep open | grep -v NOENT
...
open("/etc/resolv.conf", O_RDONLY) = 3
open("/etc/nsswitch.conf", O_RDONLY) = 3
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib64/libnss_files.so.2", O_RDONLY) = 3
open("/etc/host.conf", O_RDONLY) = 3
open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 3
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib64/libnss_dns.so.2", O_RDONLY) = 3
open("/lib64/libresolv.so.2", O_RDONLY) = 3