Set Accept header for crates.io API requests

Fixes: #81
Ref: rust-lang/crates.io#466
Ref: rust-lang/crates.io#464

Author: onur

src/db/add_package.rs

@@ -12,6 +12,7 @@ use cargo::core::{Package, TargetKind};
 use rustc_serialize::json::{Json, ToJson};
 use slug::slugify;
 use hyper::client::Client;
+use hyper::header::{Accept, qitem};
 use semver;
 use postgres::Connection;
 use time;
@@ -271,7 +272,9 @@ fn get_release_time_yanked_downloads
     // FIXME: There is probably better way to do this
     //        and so many unwraps...
     let client = Client::new();
-    let mut res = client.get(&url[..]).send().unwrap();
+    let mut res = try!(client.get(&url[..])
+        .header(Accept(vec![qitem("application/json".parse().unwrap())]))
+        .send());
     let mut body = String::new();
     res.read_to_string(&mut body).unwrap();
     let json = Json::from_str(&body[..]).unwrap();
@@ -385,7 +388,9 @@ fn add_owners_into_database(conn: &Connection,
     let owners_url = format!("https://crates.io/api/v1/crates/{}/owners",
                              &pkg.manifest().name());
     let client = Client::new();
-    let mut res = client.get(&owners_url[..]).send().unwrap();
+    let mut res = try!(client.get(&owners_url[..])
+        .header(Accept(vec![qitem("application/json".parse().unwrap())]))
+        .send());
     // FIXME: There is probably better way to do this
     //        and so many unwraps...
     let mut body = String::new();

src/docbuilder/queue.rs

@@ -4,6 +4,7 @@
 use super::DocBuilder;
 use rustc_serialize::json::{Json, Array};
 use hyper;
+use hyper::header::{Accept, qitem};
 use db::connect_db;
 use errors::*;
 
@@ -16,7 +17,9 @@ impl DocBuilder {
         let body = {
             use std::io::Read;
             let client = hyper::Client::new();
-            let mut res = try!(client.get("https://crates.io/summary").send());
+            let mut res = try!(client.get("https://crates.io/summary")
+                .header(Accept(vec![qitem("application/json".parse().unwrap())]))
+                .send());
             let mut body = String::new();
             try!(res.read_to_string(&mut body));
             body