---
title: Developer
summary: These articles explain how to work with the Next-Gen WAF API.
url: https://www.fastly.com/documentation/guides/next-gen-waf/developer
---

- [Agent StatsD Metrics](https://www.fastly.com/documentation/guides/next-gen-waf/developer/agent-statsd-metrics/)
- [Data flows](https://www.fastly.com/documentation/guides/next-gen-waf/developer/module-flows/)
- [Extracting your data](https://www.fastly.com/documentation/guides/next-gen-waf/developer/extract-your-data/)
- [Modifying response headers with custom modules](https://www.fastly.com/documentation/guides/next-gen-waf/developer/modifying-response-headers-with-custom-modules/)
- [Testing with attack tooling](https://www.fastly.com/documentation/guides/next-gen-waf/developer/testing-with-attack-tooling/)
- [Using an API with the Next-Gen WAF](https://www.fastly.com/documentation/guides/next-gen-waf/developer/using-an-api-with-the-next-gen-waf/)
- [X-SigSci-* request headers](https://www.fastly.com/documentation/guides/next-gen-waf/developer/x-sigsci-headers/)