feat(header): add Connection::close() and ::keep_alive() constructors

Author: seanmonstar

README.md

@@ -56,7 +56,6 @@ use std::io::Read;
 
 use hyper::Client;
 use hyper::header::Connection;
-use hyper::header::ConnectionOption;
 
 fn main() {
     // Create a client.
@@ -65,7 +64,7 @@ fn main() {
     // Creating an outgoing request.
     let mut res = client.get("http://www.gooogle.com/")
         // set a header
-        .header(Connection(vec![ConnectionOption::Close]))
+        .header(Connection::close())
         // let 'er go!
         .send().unwrap();
 

examples/client.rs

@@ -8,7 +8,6 @@ use std::io;
 
 use hyper::Client;
 use hyper::header::Connection;
-use hyper::header::ConnectionOption::Close;
 
 fn main() {
     env_logger::init().unwrap();
@@ -24,7 +23,7 @@ fn main() {
     let mut client = Client::new();
 
     let mut res = client.get(&*url)
-        .header(Connection(vec![Close]))
+        .header(Connection::close())
         .send().unwrap();
 
     println!("Response: {}", res.status);

src/header/common/connection.rs

@@ -71,6 +71,18 @@ header! {
     }
 }
 
+impl Connection {
+    /// A constructor to easily create a `Connection: close` header.
+    pub fn close() -> Connection {
+        Connection(vec![ConnectionOption::Close])
+    }
+
+    /// A constructor to easily create a `Connection: keep-alive` header.
+    pub fn keep_alive() -> Connection {
+        Connection(vec![ConnectionOption::KeepAlive])
+    }
+}
+
 bench_header!(close, Connection, { vec![b"close".to_vec()] });
 bench_header!(keep_alive, Connection, { vec![b"keep-alive".to_vec()] });
 bench_header!(header, Connection, { vec![b"authorization".to_vec()] });