Php heroku上的Laravel网站给出了；419页已过期“；关于表格提交

首先，我查看了这个问题的其他帖子，但仍然没有得到预期的结果

当我在上传到heroku之前在浏览器上提交我的网站表单时，它会将我带到Thankyu页面。但当我上传到heroku并提交表单时，我得到的是419页的过期页面

我有我的@csrf表格：

   <form role="form" id="contactForm" name="index" method="post" action="{{route('index.submit')}}">
                            @csrf
                            <div class="row">
                                <div class="col-md-6 col-sm-6">
                                    <div class="form-group">
                                        <label for="name">Name</label>
                                        <input type="text" class="form-control" id="name" name="name" placeholder="Enter name">
                                    </div>
                                    <div class="form-group">
                                        <label for="email">Email</label>
                                        <input type="email" class="form-control" id="email" name="email" placeholder="Enter email">
                                    </div>
                                    <div class="form-group">
                                        <label for="phone">Phone</label>
                                        <input type="text" class="form-control" id="phone" name="contact" placeholder="Enter phone">
                                    </div>
                                </div>
                                <div class="col-md-6 col-sm-6">
                                    <div class="form-group">
                                        <label for="message">Message</label>
                                        <textarea class="form-control" id="message" name="msg" rows="9" placeholder="Enter message"></textarea>
                                    </div>
                                </div>
                            </div>
                            <div class="text-center">
                                <button type="submit" class="btn btn-lg btn-theme">Send Message</button>
                            </div>
                        </form>

session.php

    'driver' => env('SESSION_DRIVER', 'file'),
    'lifetime' => env('SESSION_LIFETIME', 120),
    'expire_on_close' => false,
    'encrypt' => false,
    'files' => storage_path('framework/sessions'),
    'connection' => env('SESSION_CONNECTION', null),
    'table' => 'sessions',
    'store' => env('SESSION_STORE', null),
    'lottery' => [2, 100],
    'cookie' => env(
        'SESSION_COOKIE',
        Str::slug(env('APP_NAME', 'laravel'), '_').'_session'
    ),
    'path' => '/',
    'domain' => env('SESSION_DOMAIN', 'my.domain.com'),
    'secure' => env('SESSION_SECURE_COOKIE', true),
    'http_only' => true,
    'same_site' => 'lax',
    

VerifyCsrfToken.php

<?php

namespace App\Http\Middleware;

use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as Middleware;

class VerifyCsrfToken extends Middleware
{
    /**
     * The URIs that should be excluded from CSRF verification.
     *
     * @var array
     */
    protected $except = [
        //
    ];
}

    'driver' => env('SESSION_DRIVER', 'file'),
    'lifetime' => env('SESSION_LIFETIME', 120),
    'expire_on_close' => false,
    'encrypt' => false,
    'files' => storage_path('framework/sessions'),
    'connection' => env('SESSION_CONNECTION', null),
    'table' => 'sessions',
    'store' => env('SESSION_STORE', null),
    'lottery' => [2, 100],
    'cookie' => env(
        'SESSION_COOKIE',
        Str::slug(env('APP_NAME', 'laravel'), '_').'_session'
    ),
    'path' => '/',
    'domain' => env('SESSION_DOMAIN', 'my.domain.com'),
    'secure' => env('SESSION_SECURE_COOKIE', true),
    'http_only' => true,
    'same_site' => 'lax',
    


<?php

namespace App\Http\Middleware;

use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as Middleware;

class VerifyCsrfToken extends Middleware
{
    /**
     * The URIs that should be excluded from CSRF verification.
     *
     * @var array
     */
    protected $except = [
        //
    ];
}