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    use header::{HttpDate, EXPIRES};

    header! {
        /// `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
        ///
        /// ```rust
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::Expires;
        /// use std::time::{SystemTime, Duration};
        ///
        /// let mut builder = HttpResponse::Ok();
        /// let expiration = SystemTime::now() + Duration::from_secs(60 * 60 * 24);
        /// builder.set(Expires(expiration.into()));
        /// ```
        (Expires, EXPIRES) => [HttpDate]

        test_expires {
            // Test case from RFC
            test_header!(test1, vec![b"Thu, 01 Dec 1994 16:00:00 GMT"]);
        }
    }

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