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    use http::Method;
    use http::header;

    header! {
        /// `Allow` header, defined in [RFC7231](http://tools.ietf.org/html/rfc7231#section-7.4.1)
        ///
        /// The `Allow` header field lists the set of methods advertised as
        /// supported by the target resource.  The purpose of this field is
        /// strictly to inform the recipient of valid request methods associated
        /// with the resource.
        ///
        /// # ABNF
        ///
        /// ```text
        /// Allow = #method
        /// ```
        ///
        /// # Example values
        /// * `GET, HEAD, PUT`
        /// * `OPTIONS, GET, PUT, POST, DELETE, HEAD, TRACE, CONNECT, PATCH, fOObAr`
        /// * ``
        ///
        /// # Examples
        ///
        /// ```rust
        /// # extern crate http;
        /// # extern crate actix_web;
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::Allow;
        /// use http::Method;
        ///
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     Allow(vec![Method::GET])
        /// );
        /// # }
        /// ```
        ///
        /// ```rust
        /// # extern crate http;
        /// # extern crate actix_web;
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::Allow;
        /// use http::Method;
        ///
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     Allow(vec![
        ///         Method::GET,
        ///         Method::POST,
        ///         Method::PATCH,
        ///     ])
        /// );
        /// # }
        /// ```
        (Allow, header::ALLOW) => (Method)*

        test_allow {
            // From the RFC
            test_header!(
                test1,
                vec![b"GET, HEAD, PUT"],
                Some(HeaderField(vec![Method::GET, Method::HEAD, Method::PUT])));
            // Own tests
            test_header!(
                test2,
                vec![b"OPTIONS, GET, PUT, POST, DELETE, HEAD, TRACE, CONNECT, PATCH"],
                Some(HeaderField(vec![
                    Method::OPTIONS,
                    Method::GET,
                    Method::PUT,
                    Method::POST,
                    Method::DELETE,
                    Method::HEAD,
                    Method::TRACE,
                    Method::CONNECT,
                    Method::PATCH])));
            test_header!(
                test3,
                vec![b""],
                Some(HeaderField(Vec::<Method>::new())));
        }
    }

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