---
title: Client challenges
summary: >-
  These articles describe how to set up security tasks to verify users are human
  or accessing your web application through a legitimate browser.
url: https://www.fastly.com/documentation/guides/security/client-challenges
---

- [Adding custom logos to interstitial pages](https://www.fastly.com/documentation/guides/security/client-challenges/adding-custom-logos-to-interstitial-pages/)
- [Blocking requests with invalid challenge tokens](https://www.fastly.com/documentation/guides/security/client-challenges/blocking-requests-with-invalid-challenge-tokens/)
- [Embedding dynamic challenges in pages](https://www.fastly.com/documentation/guides/security/client-challenges/embedding-dynamic-challenges-in-pages/)
- [Getting started with client challenges](https://www.fastly.com/documentation/guides/security/client-challenges/getting-started-with-client-challenges/)
- [How client challenges work](https://www.fastly.com/documentation/guides/security/client-challenges/how-client-challenges-work/)
- [Serving challenges with interstitial pages](https://www.fastly.com/documentation/guides/security/client-challenges/serving-challenges-with-interstitial-pages/)