Дмитрий Лузанов

// AJAX Request Handler
func ajaxHandler(w http.ResponseWriter, r *http.Request) {
    //parse request to struct
    var d Data
    err := json.NewDecoder(r.Body).Decode(&d)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
    }

    // create json response from struct
    a, err := json.Marshal(d)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
    }
    w.Write(a)
}