Every time I change a ULR (or a set of URLs), I put a test for the redirect into my end-2-end tests, which run once per day. So I know all my URLs will work forever.<p>I have not thought about it for years now. Just checked for my first ever Show HN from 10 years ago:<p><a href="https://news.ycombinator.com/item?id=7465980">https://news.ycombinator.com/item?id=7465980</a><p>The URL has long changed, but the redirect still works. Phew :) So all seems to be good. Here's to the next 10 years!<p>Google should do the same. Set up a seperate server for the redirect service itself. And then I guess they have multi project end-2-end tests running somewhere in their infrastructure. Just add testing this service and thats it. Amount of work per year to keep it up should be less than an hour, right?