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use super::{HttpDate, IF_MODIFIED_SINCE};
crate::http::header::common_header! {
/// `If-Modified-Since` header, defined
/// in [RFC 7232 ยง3.3](https://datatracker.ietf.org/doc/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.
///
/// # Note
/// This is a request header used for cache validation. Servers should not send
/// `If-Modified-Since` in responses; use [`LastModified`](super::LastModified) / the
/// `Last-Modified` header instead.
///
/// # ABNF
/// ```plain
/// If-Modified-Since = HTTP-date
/// ```
///
/// # Example Values
/// * `Sat, 29 Oct 1994 19:43:31 GMT`
///
/// # Examples
///
/// ```
/// use std::time::{SystemTime, Duration};
/// use actix_web::{http::header::IfModifiedSince, test};
///
/// let modified = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
/// let req = test::TestRequest::default()
/// .insert_header(IfModifiedSince(modified.into()))
/// .to_http_request();
/// # let _ = req;
/// ```
(IfModifiedSince, IF_MODIFIED_SINCE) => [HttpDate]
test_parse_and_format {
// Test case from RFC
crate::http::header::common_header_test!(test1, [b"Sat, 29 Oct 1994 19:43:31 GMT"]);
}
}