header! {
#[doc="`Content-Length` header, defined in"]
#[doc="[RFC7230](http://tools.ietf.org/html/rfc7230#section-3.3.2)"]
#[doc=""]
#[doc="When a message does not have a `Transfer-Encoding` header field, a"]
#[doc="Content-Length header field can provide the anticipated size, as a"]
#[doc="decimal number of octets, for a potential payload body. For messages"]
#[doc="that do include a payload body, the Content-Length field-value"]
#[doc="provides the framing information necessary for determining where the"]
#[doc="body (and message) ends. For messages that do not include a payload"]
#[doc="body, the Content-Length indicates the size of the selected"]
#[doc="representation."]
#[doc=""]
#[doc="# ABNF"]
#[doc="```plain"]
#[doc="Content-Length = 1*DIGIT"]
#[doc="```"]
(ContentLength, "Content-Length") => [u64]
}
bench_header!(bench, ContentLength, { vec![b"42349984".to_vec()] });