The rate limiting of requests feature of Azure Front Door is a security feature that allows you to protect your web applications by limiting the number of requests that can be made to them in a given time period. It helps prevent brute force attacks, denial of service (DoS) attacks, and other types of attacks that can overload or disrupt your web applications.
The rate limiting feature allows you to set limits on the number of requests that can be made to your web applications in a given time period, such as 100 requests per minute. You can set these limits on a per-route or per-backend basis, and you can specify different limits for different types of requests, such as GET or POST requests.
If a client exceeds the specified limit, Azure Front Door will return an HTTP 429 Too Many Requests response, indicating that the client has exceeded the rate limit. You can also configure how long the client should be blocked from making additional requests, and you can specify custom error messages to display to clients when they exceed the rate limit.
The rate limiting feature can be used in conjunction with other Azure Front Door features, such as web application firewall (WAF) and custom domain and certificate management, to provide a comprehensive security solution for your web applications.
Overall, the rate limiting of requests feature of Azure Front Door is an important security feature that helps protect your web applications from attacks by limiting the number of requests that can be made to them. It provides granular control over the rate limiting configuration and enables you to customize error messages and blocking behavior to meet your specific security needs.