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

    header! {
        /// `Content-Language` header, defined in
        /// [RFC7231](https://tools.ietf.org/html/rfc7231#section-3.1.3.2)
        ///
        /// The `Content-Language` header field describes the natural language(s)
        /// of the intended audience for the representation.  Note that this
        /// might not be equivalent to all the languages used within the
        /// representation.
        ///
        /// # ABNF
        ///
        /// ```text
        /// Content-Language = 1#language-tag
        /// ```
        ///
        /// # Example values
        ///
        /// * `da`
        /// * `mi, en`
        ///
        /// # Examples
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # #[macro_use] extern crate language_tags;
        /// use actix_web::HttpResponse;
        /// # use actix_web::http::header::{ContentLanguage, qitem};
        /// #
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     ContentLanguage(vec![
        ///         qitem(langtag!(en)),
        ///     ])
        /// );
        /// # }
        /// ```
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # #[macro_use] extern crate language_tags;
        /// use actix_web::HttpResponse;
        /// # use actix_web::http::header::{ContentLanguage, qitem};
        /// #
        /// # fn main() {
        ///
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     ContentLanguage(vec![
        ///         qitem(langtag!(da)),
        ///         qitem(langtag!(en;;;GB)),
        ///     ])
        /// );
        /// # }
        /// ```
        (ContentLanguage, CONTENT_LANGUAGE) => (QualityItem<LanguageTag>)+

        test_content_language {
            test_header!(test1, vec![b"da"]);
            test_header!(test2, vec![b"mi, en"]);
        }
    }

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