func greeting(w http.ResponseWriter, r *http.Request) {
params := webapi.Params(r)
name := params["name"].(string)
jsonapi.SetHeader(w)
p, _ := json.Marshal(map[string]string{"result": "hello, " + name + "!"})
w.Write(p)
}
func add(w http.ResponseWriter, r *http.Request) {
params := webapi.Params(r)["json"].(*struct{ X, Y int })
jsonapi.SetHeader(w)
p, _ := json.Marshal(map[string]int{"result": params.X + params.Y})
w.Write(p)
}