add cookies support for response

tests/test_httpmessage.rs

@@ -1,7 +1,9 @@
 extern crate actix_web;
 extern crate http;
+extern crate time;
 
 use actix_web::*;
+use time::Duration;
 use http::{header, Method, Uri, Version, HeaderMap, HttpTryFrom};
 
 
@@ -30,3 +32,35 @@ fn test_request_cookies() {
     assert_eq!(cookies[1].name(), "cookie2");
     assert_eq!(cookies[1].value(), "value2");
 }
+
+#[test]
+fn test_response_cookies() {
+    let mut headers = HeaderMap::new();
+    headers.insert(header::COOKIE,
+                   header::HeaderValue::from_static("cookie1=value1; cookie2=value2"));
+
+    let mut req = HttpRequest::new(
+        Method::GET, Uri::try_from("/").unwrap(), Version::HTTP_11, headers);
+    let cookies = req.load_cookies().unwrap();
+
+    let resp = httpcodes::HTTPOk
+        .builder()
+        .cookie(Cookie::build("name", "value")
+                .domain("www.rust-lang.org")
+                .path("/test")
+                .http_only(true)
+                .max_age(Duration::days(1))
+                .finish())
+        .del_cookie(&cookies[0])
+        .body(Body::Empty);
+
+    assert!(resp.is_ok());
+    let resp = resp.unwrap();
+
+    let mut val: Vec<_> = resp.headers().get_all("Set-Cookie")
+        .iter().map(|v| v.to_str().unwrap().to_owned()).collect();
+    val.sort();
+    assert!(val[0].starts_with("cookie1=; Max-Age=0;"));
+    assert_eq!(
+        val[1],"name=value; HttpOnly; Path=/test; Domain=www.rust-lang.org; Max-Age=86400");
+}