Added an acceptable middleware

app/Http/Middleware/Acceptable.php

@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of Cachet.
+ *
+ * (c) Cachet HQ <support@cachethq.io>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CachetHQ\Cachet\Http\Middleware;
+
+use Closure;
+use Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException;
+
+class Acceptable
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param \Illuminate\Http\Request $request
+     * @param \Closure                 $next
+     * @param string                   $type
+     *
+     * @return mixed
+     */
+    public function handle($request, Closure $next, $type)
+    {
+        if (!$request->accepts($type)) {
+            throw new NotAcceptableHttpException();
+        }
+
+        return $next($request);
+    }
+}