Redirect Middleware

Redirect middleware is a software component inserted into the request processing pipeline that intercepts requests and conditionally redirects them before reaching the application's core logic. Middleware executes in a defined order, enabling layered redirect rules. Common middleware functions include: HTTPS enforcement, www/non-www normalization, trailing slash handling, locale-based routing, maintenance mode redirects, and vanity URL resolution. URL shortening services are essentially specialized redirect middleware operating at scale. The entire service functions as middleware between the user's click and the destination server. Understanding middleware patterns helps service architects design efficient redirect pipelines that minimize latency while supporting features like A/B testing, geographic routing, and access control checks.