Sites such as StackExchange use URLs that contain a page code and some additional keywords, possibly for SEO. If you change anything in the additional keywords, you are still redirected to the correct long URL.
Example: the following links redirect to the same page:
As long as the page code (
/questions/724) is in the link, it is valid. So, we can construct many links that still resolve to the same page, e.g.
This is very interesting for future-proof URLs, as the title of a page could change, but the URLs would still redirect to the correct page.
Can this be accomplished by using existing Drupal modules?