The actual error message is #501 not implemented
Here is a simplified bit of code that returns the same error
First, a copy of the robots.txt file from the site used (www.archive.org):

##############################################
#
# Welcome to the Archive!
#
##############################################
# Please crawl our files.
# We appreciate if you can crawl responsibly.
# Stay open!
##############################################
# slow down the ask jeeves crawler which was hitting our SE a little t
+oo fast
# via collection pages.   --Feb2008 tracey--
User-agent: Teoma
Disallow: /control/
Disallow: /report/
Sitemap: http://www.archive.org/sitemap/sitemap.xml
Crawl-delay: 10


User-agent: *
Disallow: /control/
Disallow: /report/
Disallow: /details/goldenbull2007john/
Disallow: /stream/goldenbull2007john/
Disallow: /download/goldenbull2007john/
Disallow: /14/items/goldenbull2007john/goldenbull2007john_djvu.txt
Sitemap: http://www.archive.org/sitemap/sitemap.xml
Crawl-delay: 10

[download]

Next a small portion of the sitemap.xml
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>
http://www.archive.org/sitemap/sitemap_00000.xml.gz
</loc>
<lastmod>
2012-01-24T11:32:13Z
</lastmod>
</sitemap>
<sitemap>
<loc>
http://www.archive.org/sitemap/sitemap_00001.xml.gz
</loc>
<lastmod>
2012-01-24T11:32:18Z
</lastmod>
</sitemap>

[download]

And a simple perl script with error checking
#!/usr/bin/env perl
#
# Name: TestFetch.pl
#
# Requires Internet access
#
use strict;
use warnings;
use LWP::Simple;
use HTML::Parser;
use HTTP::Status qw(:constants :is status_message);

package main;

my $text = 'http://www.archive.org/sitemap/sitemap_00000.xml.gz';
my $filename = 'sitemap_00000.xml.gz';
my $hstatus = 0;

$hstatus =  LWP::Simple->getstore ($text, $filename);

if($hstatus != HTTP_OK) {
   print "$hstatus: ", status_message($hstatus), "\n";
}

[download]

I am able to fetch the file manually
Largins

In reply to Re^2: using LWP::Simple to fetch binary file (gnu zip) by Largins
in thread using LWP::Simple to fetch binary file (gnu zip) by Largins

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