Some of the links return to be OK but some of them which are acctually exists give me the "404 Not Found" errors.

That second Netscape URL returns a 404 response when I hit it through a browser, and a 404 response when I hit it through LWP. The responses are different, which could be attributable to one of several things:

Without a lot of experimenting, it's hard to tell which.

Update: You've correct the second URL. That one does work for me. You might be having an issue with your proxy server.

In reply to Re: LWP Problem by dws
in thread LWP::UserAgent, HTTP proxy, 404 Not Found by Anonymous Monk

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