Merge pull request #8773 from cakephp/arrayaccess-fix

Fix ArrayAccess implemention in Request class.

src/Network/Request.php

@@ -1347,6 +1347,9 @@ class Request implements ArrayAccess
      */
     public function offsetExists($name)
     {
+        if ($name === 'url' || $name === 'data') {
+            return true;
+        }
         return isset($this->params[$name]);
     }