중복된 서버 헤더를 방지하기 위해 Go 미들웨어가 HTTP 헤더를 어떻게 제어할 수 있습니까?

type serverWriter struct {
    w           http.ResponseWriter
    name         string
    wroteHeader  bool
}

func (s serverWriter) WriteHeader(code int) {
    if !s.wroteHeader {
        s.w.Header().Set("Server", s.name)
        s.wroteHeader = true
    }
    s.w.WriteHeader(code)
}

func (s serverWriter) Write(b []byte) (int, error) {
    return s.w.Write(b)
}

func (s serverWriter) Header() http.Header {
    return s.w.Header()
}

// Server attaches a Server header to the response.
func Server(h http.Handler, serverName string) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        sw := serverWriter{
            w:           w,
            name:         serverName,
            wroteHeader:  false,
        }
        h.ServeHTTP(sw, r)
    })
}