actix-web was built on top of
actix, a powerful and fast actor system.
actix-web is largely unrelated to the actor framework and is built using a different system.
actix is still maintained, its usefulness as a general tool is diminishing as the
futures and async/await ecosystem matures. At this time, the use of
actix is only required for
actix-web a powerful and pragmatic framework. For all intents and purposes it’s a
micro-framework with a few twists. If you are already a Rust programmer you will probably find
yourself at home quickly, but even if you are coming from another programming language you should
actix-web easy to pick up.
An application developed with
actix-web will expose an HTTP server contained within a native
executable. You can either put this behind another HTTP server like nginx or serve it up as-is. Even
in the complete absence of another HTTP server
actix-web is powerful enough to provide HTTP/1 and
HTTP/2 support as well as TLS (HTTPS). This makes it useful for building small services ready for
actix-web runs on Rust 1.42 or later and it works
with stable releases.