Actix web

Asynchronous web framework for Actix.

API Documentation (Development)
API Documentation (Releases)
Cargo package: actix-web
Minimum supported Rust version: 1.20 or later

Actix web is licensed under the Apache-2.0 license.

Features

Supported HTTP/1 and HTTP/2 protocols
Streaming and pipelining
Keep-alive and slow requests handling
WebSockets
Transparent content compression/decompression (br, gzip, deflate)
Configurable request routing
Multipart streams
Middlewares

Usage

To use actix-web, add this to your Cargo.toml:

[dependencies]
actix-web = "0.2"

HTTP/2

Actix web automatically upgrades connection to http/2 if possible.

Negotiation

HTTP/2 protocol over tls without prior knowlage requires tls alpn. At the moment only rust-openssl supports alpn.

[dependencies]
actix-web = { git = "https://github.com/actix/actix-web", features=["alpn"] }

Upgrade to http/2 schema described in rfc section 3.2 is not supported. Starting http/2 with prior knowledge is supported for both clear text connection and tls connection. rfc section 3.4

Example

extern crate actix;
extern crate actix_web;
extern crate env_logger;

use actix::*;
use actix_web::*;


struct MyWebSocket;

/// Actor with http context
impl Actor for MyWebSocket {
    type Context = HttpContext<Self>;
}

/// Http route handler
impl Route for MyWebSocket {
    type State = ();

    fn request(req: &mut HttpRequest,
               payload: Payload, ctx: &mut HttpContext<Self>) -> RouteResult<Self>
    {
        // websocket handshake
        let resp = ws::handshake(req)?;
        // send HttpResponse back to peer
        ctx.start(resp);
        // convert bytes stream to a stream of `ws::Message` and handle stream
        ctx.add_stream(ws::WsStream::new(payload));
        Reply::async(MyWebSocket)
    }
}

/// Standard actix's stream handler for a stream of `ws::Message`
impl StreamHandler<ws::Message> for MyWebSocket {
    fn started(&mut self, ctx: &mut Self::Context) {
        println!("WebSocket session openned");
    }

    fn finished(&mut self, ctx: &mut Self::Context) {
        println!("WebSocket session closed");
    }
}

impl Handler<ws::Message> for MyWebSocket {
    fn handle(&mut self, msg: ws::Message, ctx: &mut HttpContext<Self>)
              -> Response<Self, ws::Message>
    {
        // process websocket messages
        println!("WS: {:?}", msg);
        match msg {
            ws::Message::Ping(msg) => ws::WsWriter::pong(ctx, &msg),
            ws::Message::Text(text) => ws::WsWriter::text(ctx, &text),
            ws::Message::Binary(bin) => ws::WsWriter::binary(ctx, bin),
            ws::Message::Closed | ws::Message::Error => {
                ctx.stop();
            }
            _ => (),
        }
        Self::empty()
    }
}

fn main() {
    ::std::env::set_var("RUST_LOG", "actix_web=info");
    let _ = env_logger::init();
    let sys = actix::System::new("ws-example");

    HttpServer::new(
        Application::default("/")
            // enable logger
            .middleware(Logger::new(None))
            // websocket route
            .resource("/ws/", |r| r.get::<MyWebSocket>())
            .route_handler("/", StaticFiles::new("examples/static/", true)))
        .serve::<_, ()>("127.0.0.1:8080").unwrap();

    Arbiter::system().send(msgs::SystemExit(0));
    let _ = sys.run();
}

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