diff --git a/benches/client.rs b/benches/client.rs
index 266cf043..c75cc030 100644
--- a/benches/client.rs
+++ b/benches/client.rs
@@ -47,6 +47,7 @@ fn bench_curl(b: &mut test::Bencher) {
     listening.close().unwrap()
 }
 
+#[deriving(Clone)]
 struct Foo;
 
 impl hyper::header::Header for Foo {
diff --git a/benches/client_mock_tcp.rs b/benches/client_mock_tcp.rs
index 0f84cf0c..710b2b1b 100644
--- a/benches/client_mock_tcp.rs
+++ b/benches/client_mock_tcp.rs
@@ -68,6 +68,7 @@ fn bench_mock_curl(b: &mut test::Bencher) {
     });
 }
 
+#[deriving(Clone)]
 struct Foo;
 
 impl hyper::header::Header for Foo {
diff --git a/src/header/common/authorization.rs b/src/header/common/authorization.rs
index 2e74ad9f..99225f92 100644
--- a/src/header/common/authorization.rs
+++ b/src/header/common/authorization.rs
@@ -39,7 +39,7 @@ impl<S: Scheme> HeaderFormat for Authorization<S> {
 }
 
 /// An Authorization scheme to be used in the header.
-pub trait Scheme: FromStr + Send + Sync {
+pub trait Scheme: FromStr + Clone + Send + Sync {
     /// An optional Scheme name.
     ///
     /// For example, `Basic asdf` has the name `Basic`. The Option<Self> is
diff --git a/src/header/mod.rs b/src/header/mod.rs
index adbd2dfa..be598074 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -41,17 +41,22 @@ pub trait Header: Typeable + Send + Sync {
     /// than one field value. If that's the case, you **should** return `None`
     /// if `raw.len() > 1`.
     fn parse_header(raw: &[Vec<u8>]) -> Option<Self>;
+
 }
 
 /// A trait for any object that will represent a header field and value.
 ///
 /// This trait represents the formatting of a Header for output to a TcpStream.
-pub trait HeaderFormat: Typeable + Send + Sync {
+pub trait HeaderFormat: Clone + Typeable + Send + Sync {
     /// Format a header to be output into a TcpStream.
     ///
     /// This method is not allowed to introduce an Err not produced
     /// by the passed-in Formatter.
     fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result;
+
+    #[doc(hidden)]
+    #[inline]
+    fn clone_box(&self) -> Box<HeaderFormat + Sync + Send> { box self.clone() }
 }
 
 #[doc(hidden)]
@@ -81,12 +86,19 @@ impl<'a> UncheckedAnyMutDowncast<'a> for &'a mut HeaderFormat {
     }
 }
 
+impl Clone for Box<HeaderFormat + Send + Sync> {
+    fn clone(&self) -> Box<HeaderFormat + Send + Sync> {
+        self.clone_box()
+    }
+}
+
 fn header_name<T: Header + HeaderFormat>() -> &'static str {
     let name = Header::header_name(None::<T>);
     name
 }
 
 /// A map of header fields on requests and responses.
+#[deriving(Clone)]
 pub struct Headers {
     data: HashMap<CaseInsensitive<SendStr>, RWLock<Item>>
 }
@@ -315,6 +327,7 @@ impl<'a> fmt::Show for HeaderView<'a> {
     }
 }
 
+#[deriving(Clone)]
 struct Item {
     raw: Option<Vec<Vec<u8>>>,
     typed: Option<Box<HeaderFormat + Send + Sync>>
@@ -353,12 +366,19 @@ impl fmt::Show for Item {
     }
 }
 
+impl Clone for RWLock<Item> {
+    fn clone(&self) -> RWLock<Item> {
+        RWLock::new(self.read().clone())
+    }
+}
+
 impl fmt::Show for Box<HeaderFormat + Send + Sync> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         (**self).fmt_header(fmt)
     }
 }
 
+#[deriving(Clone)]
 struct CaseInsensitive<S: Str>(S);
 
 impl<S: Str> Str for CaseInsensitive<S> {