I've got a URL that loads fine in a browser, but get() using WWW::Mechanize fails with "501 Not Implemented". What does that suggest?

Code follows. 

#!perl
# Automated navigation through web pages

use strict;
use warnings;

use WWW::Mechanize;

my $a = WWW::Mechanize->new(
    autocheck => 1,
    agent     => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)'
);

my $testpage = 'http://myprodportalv2.whatever.com:7778/portal/page?_p
+ageid=33,30917,33_30962&_dad=puno2o&_schema=PORTAL_PUNO2O';

$a->get($testpage);
$a->success() or do {
    ## This dumps an empty file
    open PAGE, '>failpage.html';
    print PAGE $a->content;
    close PAGE;
    die 'Get failed: "'.$a->res->status_line."\" for\n".$testpage."\n 
+or ".$a->base()."\n";
};

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In reply to Mechanize and "Not implemented" by Roy Johnson

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