Problem with Form

[Belmar Santanilla Gutiérrez]

Dear friends! 

Today I doubt, I am following an example of Laravel CookBook and have the following code: 

View:

@extends("layout")
@section("content")
       {{ Form::open(['route'=>'user/login', 'autocomplete'=>'off']) }}
       {{ Form::label("username", "Username") }}
       {{ Form::text("username", "", ["placeholder"=>"john.smith"]) }}
       {{ Form::label("password", "Password") }}
       {{ Form::password("password", ["placeholder"=>"********"]) }}
       @if($error = $errors->first("password"))
       <div class="error">
               {{ $error }}
       </div>
       @endif        
       {{ Form::submit("login") }}
       {{ Form::close() }}
@stop
@section("footer")
       @parent
       <script src="//polyfill.io"></script>
@stop

Controller:
       public function loginAction(){
               $data = [];                
               if(Input::server("REQUEST_METHOD") == "POST"){
                       $validator = Validator::make(Input::all(), [
                               "username" => "required",
                               "password" => "required"
                       ]);

                       if($validator->passes()){
                               echo "El Usuario se ha logueado";
                       }
                       else{
                               $data["errors"] = new MessageBag([
                                       "password" => [
                                               "Username and/or password Invalid"
                                       ]
                               ]);
                       }
               }
               return View::make("user/login", $data);
       }

And routes:
Route::any('/', [
       "as" => "user/login",
       "uses" => "UserController@loginAction"
]);

The problem is when I send the form data does not validate me and is basically because although the POST form is always comes as GET to submit the form.