Salvo

Middleware is implemented as a simple handler, reducing complexity and making it easy to write and understand, as shown in the README where adding a header is just a function annotated with #[handler].

Out-of-the-box support for HTTP/1, HTTP/2, and HTTP/3, eliminating the need for additional configuration or libraries for modern web standards.

Built-in integration with ACME providers like Let's Encrypt for automatic certificate management, simplifying HTTPS setup in production deployments with just a few lines of code.

First-class support for auto-generating OpenAPI documentation via simple annotations, such as changing #[handler] to #[endpoint], streamlining API development and documentation.

Native WebSocket and WebTransport support enables real-time applications without relying on external libraries, as highlighted in the features list.