use header::HttpDate;
header! {
#[doc="`If-Unmodified-Since` header, defined in"]
#[doc="[RFC7232](http://tools.ietf.org/html/rfc7232#section-3.4)"]
#[doc=""]
#[doc="The `If-Unmodified-Since` header field makes the request method"]
#[doc="conditional on the selected representation's last modification date"]
#[doc="being earlier than or equal to the date provided in the field-value."]
#[doc="This field accomplishes the same purpose as If-Match for cases where"]
#[doc="the user agent does not have an entity-tag for the representation."]
#[doc=""]
#[doc="# ABNF"]
#[doc="```plain"]
#[doc="If-Unmodified-Since = HTTP-date"]
#[doc="```"]
(IfUnmodifiedSince, "If-Unmodified-Since") => [HttpDate]
}
bench_header!(imf_fixdate, IfUnmodifiedSince, { vec![b"Sun, 07 Nov 1994 08:48:37 GMT".to_vec()] });
bench_header!(rfc_850, IfUnmodifiedSince, { vec![b"Sunday, 06-Nov-94 08:49:37 GMT".to_vec()] });
bench_header!(asctime, IfUnmodifiedSince, { vec![b"Sun Nov 6 08:49:37 1994".to_vec()] });