1 files changed, 50 insertions, 0 deletions
diff --git a/third_party/rust/headers/src/common/expires.rs b/third_party/rust/headers/src/common/expires.rs
new file mode 100644
index 0000000000..26a44eeba9
--- /dev/null
+++ b/third_party/rust/headers/src/common/expires.rs
@@ -0,0 +1,50 @@
+use std::time::SystemTime;
+use util::HttpDate;
+
+/// `Expires` header, defined in [RFC7234](http://tools.ietf.org/html/rfc7234#section-5.3)
+///
+/// The `Expires` header field gives the date/time after which the
+/// response is considered stale.
+///
+/// The presence of an Expires field does not imply that the original
+/// resource will change or cease to exist at, before, or after that
+/// time.
+///
+/// # ABNF
+///
+/// ```text
+/// Expires = HTTP-date
+/// ```
+///
+/// # Example values
+/// * `Thu, 01 Dec 1994 16:00:00 GMT`
+///
+/// # Example
+///
+/// ```
+/// # extern crate headers;
+/// use headers::Expires;
+/// use std::time::{SystemTime, Duration};
+///
+/// let time = SystemTime::now() + Duration::from_secs(60 * 60 * 24);
+/// let expires = Expires::from(time);
+/// ```
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Expires(HttpDate);
+
+derive_header! {
+    Expires(_),
+    name: EXPIRES
+}
+
+impl From<SystemTime> for Expires {
+    fn from(time: SystemTime) -> Expires {
+        Expires(time.into())
+    }
+}
+
+impl From<Expires> for SystemTime {
+    fn from(date: Expires) -> SystemTime {
+        date.0.into()
+    }
+}