AWS Web Application Firewall

AWS WAF is a web application firewall that helps you define various rules in the form of conditions and access control lists to secure your web applications from common security threats, such as cross-site scripting, DDoS attacks, SQL injections, and so on. These threats may result in application unavailability or an application consuming excessive resources due to an increase in malicious web traffic.

You secure your websites and web applications by monitoring, controlling, and filtering HTTP and HTTPS requests received by the Application Load Balancer and Amazon CloudFront. You can allow or reject these requests based on various filters, such as the IP address sending these requests, header values, URI strings, and so on. These security features do not impact the performance of your web applications.

AWS WAF enables you to perform three behaviors--allowing all requests other than the ones that are specified by the access control lists; blocking all requests other...