使用laravel 5.6提交安培表格后的重定向问题

Question

这是我的带有动作xhr的AMp表格

<form method="post" action-xhr="{{ url('/ampsearch') }}" target="_top">
    <input class="search-toolbar__field js-search-field" type="text" placeholder="Srarch" value="beet" name="var" autocomplete="off">
    <input class="search-toolbar__cta" type="submit">
</form>

Routes

Route::post('/ampsearch', 'User\HomeController@ampsearch')->name('ampsearch');
Route::get('/searchresult', 'User\HomeController@searchresult')->name('searchresult');

在这里，我在action-xhr中提到了rout uri（用于调用控制器）。

这是我的控制器代码：

public function ampsearch(Request $request)
    {
        $post = $request->all();
        $var = $post['var'];

        Session::put('var', $var);      

        if($var==null || $var=='' || $var==' ')
        {
            $res_product = array();
            $response['key_word'] = $var;
            return view('ampsearch')->with('data', $response);
        }
        else
        {
            $res_product = Product::where('prod_name', 'LIKE', '%'.$var.'%')
                    ->orWhere('prod_description', 'LIKE', '%'.$var.'%')->get();         
            $response['data'] = $res_product;
            $response['key_word'] = $var;
            return view('ampsearch')->with('data', $response);
        }
    }

所以我收到此错误：

  

Symfony \组件\ HttpKernel \异常\   MethodNotAllowedHttpException   enter image description here