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So your fix was to move the responsibility to the web server and Redis instance? I guess that works but introduces a whole lot more complexity (you mentioned adding rate limiting) and potential for complete outage in the event a lot of requests for images come in again.

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That's my worry too. Our server load for our Rails server hasn't gone up even though our throughput has maxed out at 76k requests/second (which I think is a bunch of people from Hacker News going to the Hardcover homepage and downloading 100 images).

I don't like that if Rails goes down our images go down. I'd much prefer to separate these out and show the signed URLs in Next.js and be able to generate them through the API. I think we'll get there, but that's a bigger change than I could reliably make in a day.

I don’t have a ton of use cases for functions where they make great sense, not just fill in a bingo card, but generating access errors cheaply is a big one.

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