add method
Implementation
void add(Method method, String path, HttpHandler handler) {
_routes
.putIfAbsent(method.value, () => [])
.add(RouteHandler(path, handler));
}
void add(Method method, String path, HttpHandler handler) {
_routes
.putIfAbsent(method.value, () => [])
.add(RouteHandler(path, handler));
}