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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.

Replies are listed 'Best First'.
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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Corion idly wonders about creating a series of HTTP requests. There seems to be no framework to generate a series of HTTP requests, like "try all these requests"
[Corion]: This is vaguely inspired by that list of "nasty" strings, which I'd like to replace among HTTP parameters, just to see whether the application crashes, but also for easy downloading of a list of URLs etc
[Corion]: Maybe I'll just conoct something using Algorithm::Permute to create an (OO) generator for such requests, or a simple function.
[Corion]: For testing I imagine one would want to test a random sampling of such "bad"/"unexpected" requests, while for downloading, one would want to generate them all in order, but not necessarily as a huge list

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