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This is not possible without the help of a third party tool/spider/bot that has already crawled these redirects and stored this information (eg. a search engine).
At www.example.com you have no way of knowing whether the request arrived via a redirection from example.redirect, since the request comes from the client's machine (user-agent) not example....
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Steve's answer is mostly correct: it is indeed possible for the content to differ between http and https versions of the page.
One correction I'd suggest is that you don't actually need to do a redirect to accomplish this. For instance, with the Apache webserver, you could use the "Listen" directive to direct requests to different DocumentRoots. (...
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It is possible to display different content for http or https by redirecting via htaccess, but then it would be a different page that would be loading.
https is simply loading a SSL certificate, I suspect in very close to 100% of cases, the same page with the same content would be loaded.
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