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Description

A Web application firewall is a special type of application firewall that applies specifically to Web applications. It is deployed in front of Web applications and analyzes bi-directional web-based (HTTP) traffic detecting and blocking anything malicious. The OWASP provides a broad technical definition for a WAF as "a security solution on the Web application level which from a technical point of view does not depend on the application itself". According to the PCI DSS Information Supplement

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