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    use header::{HttpDate, IF_UNMODIFIED_SINCE};

    header! {
        /// `If-Unmodified-Since` header, defined in
        /// [RFC7232](http://tools.ietf.org/html/rfc7232#section-3.4)
        ///
        /// The `If-Unmodified-Since` header field makes the request method
        /// conditional on the selected representation's last modification date
        /// being earlier than or equal to the date provided in the field-value.
        /// This field accomplishes the same purpose as If-Match for cases where
        /// the user agent does not have an entity-tag for the representation.
        ///
        /// # ABNF
        ///
        /// ```text
        /// If-Unmodified-Since = HTTP-date
        /// ```
        ///
        /// # Example values
        ///
        /// * `Sat, 29 Oct 1994 19:43:31 GMT`
        ///
        /// # Example
        ///
        /// ```rust
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::IfUnmodifiedSince;
        /// use std::time::{SystemTime, Duration};
        ///
        /// let mut builder = HttpResponse::Ok();
        /// let modified = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
        /// builder.set(IfUnmodifiedSince(modified.into()));
        /// ```
        (IfUnmodifiedSince, IF_UNMODIFIED_SINCE) => [HttpDate]

        test_if_unmodified_since {
            // Test case from RFC
            test_header!(test1, vec![b"Sat, 29 Oct 1994 19:43:31 GMT"]);
        }
    }

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