internal/

Package expvar is the standard Golang's expvar package with one modification: it removes the bad practice of using `init()`, instead exposes: - `Start`: does everything the old `init` does - `PublishCmdLine`: publishes command line information - `PublishMemStats`: publishes memory statistics - `RegisterHandler`: registers the standard endpoint: `GET /debug/vars`.

Package logger provides server's logging powered by Sypl.

Package middleware offers common, and usual middlewares.

Package validation provides data validation.