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header! {
/// `User-Agent` header, defined in
/// [RFC7231](http://tools.ietf.org/html/rfc7231#section-5.5.3)
///
/// The `User-Agent` header field contains information about the user
/// agent originating the request, which is often used by servers to help
/// identify the scope of reported interoperability problems, to work
/// around or tailor responses to avoid particular user agent
/// limitations, and for analytics regarding browser or operating system
/// use. A user agent SHOULD send a User-Agent field in each request
/// unless specifically configured not to do so.
///
/// # ABNF
///
/// ```text
/// User-Agent = product *( RWS ( product / comment ) )
/// product = token ["/" product-version]
/// product-version = token
/// ```
///
/// # Example values
///
/// * `CERN-LineMode/2.15 libwww/2.17b3`
/// * `Bunnies`
///
/// # Notes
///
/// * The parser does not split the value
///
/// # Example
///
/// ```
/// use hyper::header::{Headers, UserAgent};
///
/// let mut headers = Headers::new();
/// headers.set(UserAgent::new("hyper/0.5.2"));
/// ```
(UserAgent, "User-Agent") => Cow[str]
test_user_agent {
// Testcase from RFC
test_header!(test1, vec![b"CERN-LineMode/2.15 libwww/2.17b3"]);
// Own testcase
test_header!(test2, vec![b"Bunnies"], Some(UserAgent::new("Bunnies")));
}
}