Set Content-Type on 'MsgPack' responses.

Fixes #1009.

contrib/lib/src/msgpack.rs

@@ -16,13 +16,13 @@
 extern crate serde;
 extern crate rmp_serde;
 
+use std::io::Read;
 use std::ops::{Deref, DerefMut};
-use std::io::{Cursor, Read};
 
 use rocket::request::Request;
 use rocket::outcome::Outcome::*;
 use rocket::data::{Outcome, Transform, Transform::*, Transformed, Data, FromData};
-use rocket::response::{self, Responder, Response};
+use rocket::response::{self, Responder, content};
 use rocket::http::Status;
 
 use self::serde::Serialize;
@@ -153,14 +153,12 @@ impl<'a, T: Deserialize<'a>> FromData<'a> for MsgPack<T> {
 /// Content-Type `MsgPack` and a fixed-size body with the serialization. If
 /// serialization fails, an `Err` of `Status::InternalServerError` is returned.
 impl<T: Serialize> Responder<'static> for MsgPack<T> {
-    fn respond_to(self, _: &Request) -> response::Result<'static> {
+    fn respond_to(self, req: &Request) -> response::Result<'static> {
         rmp_serde::to_vec(&self.0).map_err(|e| {
             error_!("MsgPack failed to serialize: {:?}", e);
             Status::InternalServerError
         }).and_then(|buf| {
-            Response::build()
-                .sized_body(Cursor::new(buf))
-                .ok()
+            content::MsgPack(buf).respond_to(req)
         })
     }
 }

examples/msgpack/src/tests.rs

@@ -13,6 +13,7 @@ fn msgpack_get() {
     let client = Client::new(rocket()).unwrap();
     let mut res = client.get("/message/1").header(ContentType::MsgPack).dispatch();
     assert_eq!(res.status(), Status::Ok);
+    assert_eq!(res.content_type(), Some(ContentType::MsgPack));
 
     // Check that the message is `[1, "Hello, world!"]`
     assert_eq!(&res.body_bytes().unwrap(),