add header if no Accept is set

src/client.rs

@@ -3,7 +3,7 @@ use std::io::{self, Read};
 use std::sync::{Arc, Mutex};
 
 use hyper::client::IntoUrl;
-use hyper::header::{Headers, ContentType, Location, Referer, UserAgent};
+use hyper::header::{Headers, ContentType, Location, Referer, UserAgent, Accept};
 use hyper::method::Method;
 use hyper::status::StatusCode;
 use hyper::version::HttpVersion;
@@ -197,6 +197,10 @@ impl RequestBuilder {
             self.headers.set(UserAgent(DEFAULT_USER_AGENT.to_owned()));
         }
 
+        if !self.headers.has::<Accept>() {
+            self.headers.set(Accept::star());
+        }
+
         let client = self.client;
         let mut method = self.method;
         let mut url = try!(self.url);