Merge actix-http project

actix-http/src/header/common/if_unmodified_since.rs

@@ -0,0 +1,40 @@
+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
+    ///
+    /// ```rust
+    /// use actix_http::Response;
+    /// use actix_http::http::header::IfUnmodifiedSince;
+    /// use std::time::{SystemTime, Duration};
+    ///
+    /// let mut builder = Response::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"]);
+    }
+}