Exploring ngrok's Traffic Policies for Secure Application Development
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What You'll Learn
- Restrict Prometheus metrics with ngrok traffic policies by matching the /metrics path.
- Use CEL geo variables to block or allow requests by country.
- Return a custom 404 response with CEL-interpolated country text for /uk.
Using ngrok Traffic Policies and CEL expressions to lock down a Deno API: restrict the /metrics endpoint to specific IPs, then geo-restrict /uk to United Kingdom visitors with a custom CEL-interpolated 404 response.
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