WAF stands for Web Application Layer Firewall. WAF is a application layer firewall that is meant to secure the back end web server by monitoring every HTTP request and response to and from the server.

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Evasion techiques for WAFs

Is there any documented techniques for evading Web application firewall for testing WAF rule configurations.
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What is a Web Application Firewall?

What is a Web Application Firewall (WAF) and what are some of the things to look for in an effective one? Why would you deploy a WAF instead of just an IPS?