HAProxy Rewriting
HAProxy Rewriting refers to the capability of the HAProxy load balancer to modify HTTP/HTTPS requests and responses in real-time using ACLs (Access Control Lists) and rules. It allows developers to manipulate headers, URLs, paths, and other HTTP elements to route traffic, enforce policies, or adapt client-server communication. This feature is essential for tasks like URL rewriting, header injection, cookie manipulation, and request/response transformation in web applications.
Developers should learn HAProxy Rewriting when building or managing web infrastructures that require dynamic traffic control, such as implementing A/B testing, handling API versioning, or securing applications by stripping sensitive headers. It's particularly useful in microservices architectures where requests need routing based on content, or in legacy system migrations to redirect old URLs to new endpoints without client-side changes.