Ask yourself "what is different" about the two requests, from your browser, and from your Perl code. There are two classes of common reasons for differences:
- Differences in the request.
- Differences in the processing of the response document.
For (1), remember that the request is much more than the URL: a number of headers may be sent by your browser. Headers that commonly change behaviour include Cookie, User-Agent, Referer, but any header should be looked at. You can look at the headers by sniffing the network (Wireshark), a browser plugin (e.g. Firebug for Firefox) or a proxy (Fiddler, on Windows). LWP (if that is what you are using) allows you to change the headers of your request.
Finally, think laterally--perhaps you can get your data another way. The website you mention seems to have various XML feeds.
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