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    use header::{QualityItem, ACCEPT_LANGUAGE};
    use language_tags::LanguageTag;

    header! {
        /// `Accept-Language` header, defined in
        /// [RFC7231](http://tools.ietf.org/html/rfc7231#section-5.3.5)
        ///
        /// The `Accept-Language` header field can be used by user agents to
        /// indicate the set of natural languages that are preferred in the
        /// response.
        ///
        /// # ABNF
        ///
        /// ```text
        /// Accept-Language = 1#( language-range [ weight ] )
        /// language-range  = <language-range, see [RFC4647], Section 2.1>
        /// ```
        ///
        /// # Example values
        /// * `da, en-gb;q=0.8, en;q=0.7`
        /// * `en-us;q=1.0, en;q=0.5, fr`
        ///
        /// # Examples
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # extern crate language_tags;
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::{AcceptLanguage, LanguageTag, qitem};
        ///
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// let mut langtag: LanguageTag = Default::default();
        /// langtag.language = Some("en".to_owned());
        /// langtag.region = Some("US".to_owned());
        /// builder.set(
        ///     AcceptLanguage(vec![
        ///         qitem(langtag),
        ///     ])
        /// );
        /// # }
        /// ```
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # #[macro_use] extern crate language_tags;
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::{AcceptLanguage, QualityItem, q, qitem};
        /// #
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     AcceptLanguage(vec![
        ///         qitem(langtag!(da)),
        ///         QualityItem::new(langtag!(en;;;GB), q(800)),
        ///         QualityItem::new(langtag!(en), q(700)),
        ///     ])
        /// );
        /// # }
        /// ```
        (AcceptLanguage, ACCEPT_LANGUAGE) => (QualityItem<LanguageTag>)+

        test_accept_language {
            // From the RFC
            test_header!(test1, vec![b"da, en-gb;q=0.8, en;q=0.7"]);
            // Own test
            test_header!(
                test2, vec![b"en-US, en; q=0.5, fr"],
                Some(AcceptLanguage(vec![
                    qitem("en-US".parse().unwrap()),
                    QualityItem::new("en".parse().unwrap(), q(500)),
                    qitem("fr".parse().unwrap()),
            ])));
        }
    }

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