// sizeStackHandler returns the size of the Stack.
func (c *Conn) sizeStackHandler(w http.ResponseWriter, r *http.Request, stack *pila.Stack) {
stack.Read(c.opDate)
log.Println(r.Method, r.URL, http.StatusOK, stack.Size())
w.Header().Set("Content-Type", "application/json")
// Do not check error as we consider the size
// of a stack valid for a JSON encoding.
w.Write(stack.SizeToJSON())
}
