add referer header definition

src/header/common/mod.rs

@@ -28,6 +28,7 @@ pub use self::user_agent::UserAgent;
 pub use self::vary::Vary;
 pub use self::server::Server;
 pub use self::set_cookie::SetCookie;
+pub use self::referer::Referer;
 
 macro_rules! bench_header(
     ($name:ident, $ty:ty, $value:expr) => {
@@ -144,3 +145,7 @@ pub mod user_agent;
 
 /// Exposes the Vary header.
 pub mod vary;
+
+/// Exposes the Referer header
+pub mod referer;
+

src/header/common/referer.rs

@@ -0,0 +1,35 @@
+use header::{Header, HeaderFormat};
+use std::fmt::{self, Show};
+use header::shared::util::from_one_raw_str;
+
+/// The `Referer` header.
+///
+/// The Referer header is used by user agents to inform server about
+/// the page URL user has came from.
+///
+/// See alse [RFC 1945, section 10.13](http://tools.ietf.org/html/rfc1945#section-10.13).
+///
+/// Currently just a string, but maybe better replace it with url::Url or something like it.
+#[derive(Clone, PartialEq, Show)]
+pub struct Referer(pub String);
+
+deref!(Referer => String);
+
+impl Header for Referer {
+    fn header_name(_: Option<Referer>) -> &'static str {
+        "Referer"
+    }
+
+    fn parse_header(raw: &[Vec<u8>]) -> Option<Referer> {
+        from_one_raw_str(raw).map(|s| Referer(s))
+    }
+}
+
+impl HeaderFormat for Referer {
+    fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        let Referer(ref value) = *self;
+        value.fmt(fmt)
+    }
+}
+
+bench_header!(bench, Referer, { vec![b"http://foo.com/hello:3000".to_vec()] });