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use crate::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 /// /// ``` /// use std::time::{SystemTime, Duration}; /// use actix_http::Response; /// use actix_http::http::header::IfUnmodifiedSince; /// /// let mut builder = Response::Ok(); /// let modified = SystemTime::now() - Duration::from_secs(60 * 60 * 24); /// builder.insert_header( /// 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"]); } }