Axum Web Framework

This is your comprehensive reference for building web services with Axum, Rust's ergonomic async web framework. It covers the full stack: routing patterns, type-safe extractors for request data, Tower middleware integration, state management with Arc, and error handling strategies. You'll find detailed explanations of how Axum's type system eliminates runtime parsing errors and why middleware ordering matters (spoiler: layers execute bottom-to-top unless you use ServiceBuilder). Use this when you're building REST APIs, WebSocket servers, or microservices in the Tokio ecosystem and need to understand the router's composability model or implement custom extractors. The architecture section on Tower integration is especially useful if you're coming from other frameworks.