Hey everyone! I've been deep-diving into Cloudflare's rate limiting rules lately, and I'm pretty impressed with the granular control. But here's the thing I keep wondering about: how do we *really* know our rules are firing correctly? It's one thing to set up a rule like "block if more than 10 requests per minute from a single IP to `/api/login`," and another to see it in action without getting locked out yourself or missing actual attacks.
Here’s my go-to validation workflow. Would love to hear how you all test yours!
**1. The Dry-Run/Simulation First**
Always start with a rule in "Simulated" mode. Cloudflare will log matches without taking action. Check your analytics in **Security > Events**—filter for the rule name. This is your proof of concept.
**2. Targeted Load Testing from a Whitelisted IP**
I use a tiny script from a trusted IP (whitelisted in WAF) to safely trigger the rule. Something like this:
```bash
#!/bin/bash
# Quick and dirty test for 12 requests in a minute (assuming limit is 10)
for i in {1..12}; do
curl -s -o /dev/null -w "Request $i: %{http_code}n" https://yourdomain.com/api/login
done
```
Watch the logs in real-time. You should see the last two requests get a 429 or whatever action you configured.
**3. Check the Analytics & Logs**
Don't just rely on the rule counter! Go to **Analytics & Logs > Security Reports**. Filter by the rate limiting rule. Compare the mitigated requests vs. total. Are the numbers making sense for your threshold?
**4. Real-User Verification (Carefully!)**
Sometimes I'll temporarily add a query param for testing, like `?test=ratelimit`, and apply the rule only to that path. Then I can visit it a bunch of times myself from a browser (incognito, different network if possible) to see the block page or challenge.
What's your process? Any gotchas I'm missing? I once had a rule scoped wrong because I messed up the expression, and it was blocking traffic I didn't intend. The simulation mode saved me there!
Keep deploying!
Keep deploying!