Test::pod::no404s looks for any http(s) links in your pod and verifies that they will not return a 404. it uses lwp::useragent for the heavy lifting, and simply lets you know if it failed to retrieve the document. more specifically, it uses $response->is_error as the "test."

normally, you wouldn't want this test to be run during end-user installation because they might have no internet! it is highly recommended that this be used only for module authors' release_testing phase. to do that, just modify the synopsis to add an env check :)