laravel 使用mews/captcha时session无效

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laravel中，session存在跨域问题，可使用中间件解决

在app/Http/Kernel.php的中间件中加入以下代码

protected $middleware = [
    \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
    \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
    \App\Http\Middleware\TrimStrings::class,
    \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
    \App\Http\Middleware\TrustProxies::class,

    \Illuminate\Cookie\Middleware\EncryptCookies::class,
    \Illuminate\Session\Middleware\StartSession::class,
];

重要的2条：
\Illuminate\Cookie\Middleware\EncryptCookies::class,
\Illuminate\Session\Middleware\StartSession::class,