# if_modified_since.rs.html -- source
Source to the Rust file `src/header/common/if_modified_since.rs`.
Keywords: rust, rustlang, rust-lang

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    use header::{HttpDate, IF_MODIFIED_SINCE};

    header! {
        /// `If-Modified-Since` header, defined in
        /// [RFC7232](http://tools.ietf.org/html/rfc7232#section-3.3)
        ///
        /// The `If-Modified-Since` header field makes a GET or HEAD request
        /// method conditional on the selected representation's modification date
        /// being more recent than the date provided in the field-value.
        /// Transfer of the selected representation's data is avoided if that
        /// data has not changed.
        ///
        /// # 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::IfModifiedSince;
        /// use std::time::{SystemTime, Duration};
        ///
        /// let mut builder = HttpResponse::Ok();
        /// let modified = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
        /// builder.set(IfModifiedSince(modified.into()));
        /// ```
        (IfModifiedSince, IF_MODIFIED_SINCE) => [HttpDate]

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

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