feat(server): add Response.send to write a sized body

Closes #446

src/server/response.rs

@@ -109,8 +109,6 @@ impl<'a, W: Any> Response<'a, W> {
 
         Ok(body_type)
     }
-
-
 }
 
 impl<'a> Response<'a, Fresh> {
@@ -126,6 +124,23 @@ impl<'a> Response<'a, Fresh> {
         }
     }
 
+    /// Writes the body and ends the response.
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// # use hyper::server::Response;
+    /// fn handler(res: Response) {
+    ///     res.send(b"Hello World!").unwrap();
+    /// }
+    /// ```
+    pub fn send(mut self, body: &[u8]) -> io::Result<()> {
+        self.headers.set(header::ContentLength(body.len() as u64));
+        let mut stream = try!(self.start());
+        try!(stream.write_all(body));
+        stream.end()
+    }
+
     /// Consume this Response<Fresh>, writing the Headers and Status and creating a Response<Streaming>
     pub fn start(mut self) -> io::Result<Response<'a, Streaming>> {
         let body_type = try!(self.write_head());