// popStackHandler extracts the peek element of a Stack, returns 200 and returns it.
func (c *Conn) popStackHandler(w http.ResponseWriter, r *http.Request, stack *pila.Stack) {
value, ok := stack.Pop()
if !ok {
log.Println(r.Method, r.URL, http.StatusNoContent)
w.WriteHeader(http.StatusNoContent)
return
}
stack.Update(c.opDate)
element := pila.Element{Value: value}
log.Println(r.Method, r.URL, http.StatusOK, element.Value)
w.Header().Set("Content-Type", "application/json")
// Do not check error as we consider our element
// suitable for a JSON encoding.
b, _ := element.ToJSON()
w.Write(b)
}
