I can not open route with method post in laravel

I am beginner in laravel 5.4. I add the route in web.php

Route::post('foo/bar', function () {
    return 'Hello World';
});

but when I inserthttp://localhost:8000/foo/bar url in browser I have this error :

MethodNotAllowedHttpException in RouteCollection.php line 251: in RouteCollection.php line 251 at RouteCollection->methodNotAllowed(array('POST')) in RouteCollection.php line 238 at RouteCollection->getRouteForMethods(object(Request), array('POST')) in RouteCollection.php line 176 at RouteCollection->match(object(Request)) in Router.php line 533 ...

I want test a route with method post http.

via Chebli Mohamed