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URI::Fetch and LWP::UserAgent strangeness

by szabgab (Priest)
on Dec 30, 2012 at 19:20 UTC ( #1010955=perlquestion: print w/ replies, xml ) Need Help??
szabgab has asked for the wisdom of the Perl Monks concerning the following question:

In the following example I keep getting "1: Forbidden" as output, but I don't see what is the real difference between the two calls. Can anyone see it? UIR::Fetch is at 0.09 and LWP::UserAgent is 6.04.
use strict; use warnings; use URI::Fetch; use LWP::UserAgent; my $source = 'http://thorsen.pm/atom'; my $res2 = URI::Fetch->fetch($source); print '2: ' . URI::Fetch->errstr if not $res2; my $ua = LWP::UserAgent->new; $ua->env_proxy; # force allowing of proxies my $res1 = URI::Fetch->fetch($source, UserAgent => $ua); print '1: ' . URI::Fetch->errstr if not $res1;
If I change the $source to be http://code.foo.no/feed then I keep getting "1: Bad Behavior".

Very strange. Other URLs I tried work well.

And just to explain why is this important, I am using XML::Feed to fetch and parse RSS and Atom feeds, and XML::Feed uses the code as it is written in the problematic case. So currently these two feeds keep giving me error.

Update

I found it. I think. Earlier, when I stepped through the code with the debugger I missed it, but now I saw the difference. The LWP::UserAgent created by URI::Fetch identifies itself as "URI::Fetch/0.09" while the default UserAgent I passed to the fetch method had the default identification string 'libwww-perl/6.04'.

Apparently those two servers refuse to serve to the well known Perl user agent. Probably in an attempt to fend off certain bots.

So I have to change the UserAgent in XML::Feed.

Comment on URI::Fetch and LWP::UserAgent strangeness
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Re: URI::Fetch and LWP::UserAgent strangeness
by Gryllida (Acolyte) on Jun 03, 2013 at 02:14 UTC
    How exactly do you do the "So I have to change the UserAgent in XML::Feed." thing?

      It looks like you actually have to edit the source code of XML::Feed.pm.

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