![]() Proxies typically protect client machines’ identities from web servers by positioning itself in the middle of the data flows between client and server machines. How a WAF worksĬonceptually, a WAF works like a reverse proxy. In the Open Systems Interconnection (OSI) seven-layer model, a WAF operates at the application level, which is the seventh and highest level. A WAF serves two major functions: preventing malicious traffic from reaching web applications hosted on a server and preventing unauthorized data from leaving the web server. A Web Application Firewall, as the term firewall implies, is a middleman that sits between web applications on a web server and the Internet.
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