chi
Lightweight, idiomatic & composable router to build Go HTTP services
...chi was built with the sole focus of providing an elegant and comfortable design for writing REST API servers. Its design chiefly considers project structure, maintainability, standard http handlers (stdlib-only), developer productivity, and deconstructing a large system into many small parts. It is very lightweight and fast (according to benchmarks), yet is still able to include several useful subpackages (middleware, render and docgen).