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    use header::{Charset, QualityItem, ACCEPT_CHARSET};

    header! {
        /// `Accept-Charset` header, defined in
        /// [RFC7231](http://tools.ietf.org/html/rfc7231#section-5.3.3)
        ///
        /// The `Accept-Charset` header field can be sent by a user agent to
        /// indicate what charsets are acceptable in textual response content.
        /// This field allows user agents capable of understanding more
        /// comprehensive or special-purpose charsets to signal that capability
        /// to an origin server that is capable of representing information in
        /// those charsets.
        ///
        /// # ABNF
        ///
        /// ```text
        /// Accept-Charset = 1#( ( charset / "*" ) [ weight ] )
        /// ```
        ///
        /// # Example values
        /// * `iso-8859-5, unicode-1-1;q=0.8`
        ///
        /// # Examples
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::{AcceptCharset, Charset, qitem};
        ///
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     AcceptCharset(vec![qitem(Charset::Us_Ascii)])
        /// );
        /// # }
        /// ```
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::{AcceptCharset, Charset, q, QualityItem};
        ///
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     AcceptCharset(vec![
        ///         QualityItem::new(Charset::Us_Ascii, q(900)),
        ///         QualityItem::new(Charset::Iso_8859_10, q(200)),
        ///     ])
        /// );
        /// # }
        /// ```
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::HttpResponse;
        /// use actix_web::http::header::{AcceptCharset, Charset, qitem};
        ///
        /// # fn main() {
        /// let mut builder = HttpResponse::Ok();
        /// builder.set(
        ///     AcceptCharset(vec![qitem(Charset::Ext("utf-8".to_owned()))])
        /// );
        /// # }
        /// ```
        (AcceptCharset, ACCEPT_CHARSET) => (QualityItem<Charset>)+

        test_accept_charset {
            /// Test case from RFC
            test_header!(test1, vec![b"iso-8859-5, unicode-1-1;q=0.8"]);
        }
    }

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