While LWP has cookie support, it is not enabled by default. While LWP has support for sending the Referer header, it does not do so by default. WWW::Mechanize basically provides defaults as a web browser would have them to LWP.

As was mentioned below, get a network sniffer and compare the stream that your LWP implementation sends agasint what your WWW::Mechanize implementation sends. The differences are likely what makes your LWP implementation fail.

In reply to Re^3: A case where Mechanize works, LWP doesn't by Corion
in thread A case where Mechanize works, LWP doesn't by dneedles

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