diff --git a/library/think/Input.php b/library/think/Input.php
index 473b3934..8eec91ce 100644
--- a/library/think/Input.php
+++ b/library/think/Input.php
@@ -288,6 +288,9 @@ class Input
      */
     private static function regexFilter($input, $filter)
     {
+        if(empty($filter_)){
+            return null;
+        }
         $begin = $filter[0];
         $end   = $filter[strlen($filter) - 1];
         if (is_array($input)) {
diff --git a/library/think/Route.php b/library/think/Route.php
index ce757ca7..cc11a521 100644
--- a/library/think/Route.php
+++ b/library/think/Route.php
@@ -19,6 +19,7 @@ class Route
         'POST'   => [],
         'PUT'    => [],
         'DELETE' => [],
+        'HEAD'   => [],
         '*'      => [],
     ];