MethodNotAllowedHttpException When i'm using Post Method [gloudemans-package]

recently I'm trying to create a shopping cart for my assignment project. I'm quite new to this framework, sorry if I asked something stupid :( It's a pleasure for me if you guys can check it for me. Tks

I'm also trying to switch to GET method but still didn't work

The error were:

 MethodNotAllowedHttpException

This is my controller

public function cart() {

    if (Request::isMethod('post')) {
        $product_id = Request::get('product_id');
        $product = Product::find($product_id);
        Cart::add(array('id' => $product_id, 'name' => $product->name, 'qty' => 1, 'price' => $product->price));
    }
    if (Request::get('product_id') && (Request::get('increment')) == 1) {
        $rowId = Cart::search(array('id' => Request::get('product_id')));
        $item = Cart::get($rowId[0]);

        Cart::update($rowId[0], $item->qty + 1);
    }
    if (Request::get('product_id') && (Request::get('decrease')) == 1) {
        $rowId = Cart::search(array('id' => Request::get('product_id')));
        $item = Cart::get($rowId[0]);

        Cart::update($rowId[0], $item->qty - 1);
    }

    $cart = Cart::content();

    return view('cart', array('cart' => $cart, 'title' => 'Welcome', 'description' => '', 'page' => 'home'));}

This is my Route

Route::post('cart', 'HomepageController@cart')->name('cart');

This is my view

@extends('layout')
@section('cart')       
<section id="cart_items">
    <div class="container">
        <div class="breadcrumbs">
            <ol class="breadcrumb">
                <li><a href="#">Home</a></li>
                <li class="active">Shopping Cart</li>
            </ol>
        </div>
        <div class="table-responsive cart_info">
            @if(count($cart))
            <table class="table table-condensed">
                <thead>
                    <tr class="cart_menu">
                        <td class="image">Item</td>
                        <td class="description"></td>
                        <td class="price">Price</td>
                        <td class="quantity">Quantity</td>
                        <td class="total">Total</td>
                        <td></td>
                    </tr>
                </thead>
                <tbody>
                    @foreach($cart as $item)
                    <tr>
                        <td class="cart_product">
                            <a href=""><img src="images/cart/one.png" alt=""></a>
                        </td>
                        <td class="cart_description">
                            <h4><a href=""></a></h4>
                            <p>Web ID: </p>
                        </td>
                        <td class="cart_price">
                            <p>$</p>
                        </td>
                        <td class="cart_quantity">
                            <div class="cart_quantity_button">
                                <a class="cart_quantity_up" href=""> + </a>
                                <input class="cart_quantity_input" type="text" name="quantity" value="" autocomplete="off" size="2">
                                <a class="cart_quantity_up" href=''> + </a>
                                <a class="cart_quantity_down" href=''> - </a>
                            </div>
                        </td>
                        <td class="cart_total">
                            <p class="cart_total_price">$</p>
                        </td>
                        <td class="cart_delete">
                            <a class="cart_quantity_delete" href=""><i class="fa fa-times"></i></a>
                        </td>
                    </tr>
                    @endforeach
                    @else
                <p>You have no items in the shopping cart</p>
                @endif
                </tbody>
            </table>
        </div>
    </div>
</section> <!--/#cart_items-->
@endsection

via Chebli Mohamed