in reply to Having problems getting a single page
One wise step often: take a look at the header -- a fragment from your target follows:
<iframe src="javascript:false" title="" style="width: 0px; height: 0px +; border: 0px none; display: none;"></iframe> <script type="text/javascript" async="" src="//cdn.optimizely.com/js/2 +04774041.js"></script> ....
But, as it turns out, there are several threads here about similar problems, of which, this is one: Request by LWP Useragent refused by the web server but not by others.
That was found with Super Search -- a feature here that you'll often find helpful if you're careful about picking your search_terms.
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Seekers of Perl Wisdom