LWP::UserAgent (which LWP::Simple uses) follows redirects by default for GET and HEAD requests - this is a configurable behaviour, see
requests_redirectable and
redirect_ok in the documentation.
It also stands to reason that only header redirects (ie Status: 302 Moved) is followed. Otherwise the module would need to parse the HTML looking for meta tags. Using the proper modules, or maybe just a simple regexp, this is not too hard to implement yourself, but it doesn't belong in the core module IMO. :)
Another way that some (thankfully few nowadays) do redirects is by scripting, such as javascript. This is a tougher nut to crack if needed.
You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.
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