add actix-web-cors example

examples/actix_web_cors/backend/.gitignore

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+
+/target/
+**/*.rs.bk
+Cargo.lock

examples/actix_web_cors/backend/Cargo.toml

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+[package]
+name = "Actix-web-CORS"
+version = "0.1.0"
+authors = ["krircc <krircc@aliyun.com>"]
+
+[dependencies]
+serde = "^1.0.0"
+serde_derive = "^1.0.0"
+serde_json = "^1.0.0"
+http = "^0.1.0"
+num_cpus = "1.0"
+
+actix = "^0.4.0"
+actix-web = { git = "https://github.com/actix/actix-web" }
+dotenv = "^0.10.0"
+env_logger = "^0.5.0"
+futures = "0.1"

examples/actix_web_cors/backend/src/main.rs

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+#![allow(warnings)]
+
+#[macro_use] extern crate serde_derive;
+extern crate serde;
+extern crate serde_json;
+extern crate futures;
+extern crate num_cpus;
+extern crate actix;
+extern crate actix_web;
+extern crate env_logger;
+extern crate http;
+
+use actix::*;
+use actix_web::*;
+use std::env;
+
+mod user;
+
+use http::header;
+use actix_web::middleware::cors;
+use user:: info;
+
+fn main() {
+    ::std::env::set_var("RUST_LOG", "actix_web=info");
+    let _ = env_logger::init();
+    let sys = actix::System::new("Actix-web-CORS");
+    env::set_var("RUST_BACKTRACE", "1");
+    HttpServer::new(
+        || Application::new()
+            .middleware(middleware::Logger::default())
+            .resource("/user/info", |r| {
+                cors::Cors::build()
+                .allowed_origin("http://localhost:1234")
+                .allowed_methods(vec!["GET", "POST"])
+                .allowed_headers(vec![header::AUTHORIZATION, header::ACCEPT])
+                .allowed_header(header::CONTENT_TYPE)
+                .max_age(3600)
+                .finish().expect("Can not create CORS middleware")
+                .register(r); 
+                r.method(Method::POST).a(info);
+            }))
+        .bind("127.0.0.1:8000").unwrap()
+        .shutdown_timeout(200)
+        .start();
+
+    let _ = sys.run();
+}

examples/actix_web_cors/backend/src/user.rs

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+use actix::*;
+use actix_web::*;
+use futures::future::Future;
+
+#[derive(Deserialize,Serialize, Debug)]
+struct Info {
+    username: String,
+    email: String,
+    password: String,
+    confirm_password: String,
+}
+pub fn info(mut req: HttpRequest) -> Box<Future<Item=HttpResponse, Error=Error>> {
+    req.json()                   
+       .from_err()
+       .and_then(|res: Info| {  
+            Ok(httpcodes::HTTPOk.build().json(res)?)
+       }).responder()
+}
+