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app/Http/Middleware/VerifyCsrfToken.php

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+<?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 = [
+        '/install/details',
+        '/install/post-details',
+        '/install/install-alternate',
+        '/form-data/*',
+        '/file-upload',
+        '/file-delete',
+    ];
+}