Application

Actix web provides some primitives to build web servers and applications with Rust. It provides routing, middlewares, pre-processing of requests, and post-processing of responses, websocket protcol handling, multipart streams, etc.

All actix web server is built around Application instance. It is used for registering handlers for routes and resources, middlewares. Also it stores applicationspecific state that is shared accross all handlers within same application.

Application acts as namespace for all routes, i.e all routes for specific application has same url path prefix:

# extern crate actix_web;
# extern crate tokio_core;
# use actix_web::*;
# fn index(req: HttpRequest) -> &'static str {
#    "Hello world!"
# }
# fn main() {
   let app = Application::default("/prefix")
       .resource("/index.html", |r| r.method(Method::GET).f(index))
       .finish()
# }

In this example application with /prefix prefix and index.html resource get created. This resource is available as on /prefix/index.html url.

Multiple applications could be served with one server:

# extern crate actix_web;
# extern crate tokio_core;
use std::net::SocketAddr;
use actix_web::*;
use tokio_core::net::TcpStream;

fn main() {
    HttpServer::<TcpStream, SocketAddr, _>::new(vec![
        Application::default("/app1")
            .resource("/", |r| r.route().f(|r| httpcodes::HTTPOk))
            .finish(),
        Application::default("/app2")
            .resource("/", |r| r.route().f(|r| httpcodes::HTTPOk))
            .finish(),
        Application::default("/")
            .resource("/", |r| r.route().f(|r| httpcodes::HTTPOk))
            .finish(),
    ]);
}

All /app1 requests route to first application, /app2 to second and then all other to third.

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Application

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