Best free option to protect discourse from many requests

You need to determine what’s causing the nginx rate limit to kick in. If your Discourse is correctly configured the only reason you should see that message is if there are a large number of users sat behind a single IP. Cloudflare can’t do anything to mitigate that kind of traffic either.

Discourse isn’t a website, it loads a javascript payload into the browser, putting another hop in the network path between client and server will only slow things down.

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