diff --git a/flight/Engine.php b/flight/Engine.php
index 5d8c194..879d606 100644
--- a/flight/Engine.php
+++ b/flight/Engine.php
@@ -104,6 +104,7 @@ class Engine {
         $this->set('flight.views.path', './views');
         $this->set('flight.log_errors', false);
         $this->set('flight.handle_errors', true);
+        $this->set('flight.base_url', null);
 
         $initialized = true;
     }
@@ -321,13 +322,11 @@ class Engine {
      *
      * @param int $code HTTP status code
      * @param string $message Response message
-     * @param bool $cache Cache response
      */
-    public function _halt($code = 200, $message = '', $cache = false) {
+    public function _halt($code = 200, $message = '') {
         $this->response(false)
             ->status($code)
             ->write($message)
-            ->cache($cache)
             ->send();
     }
 
@@ -440,7 +439,7 @@ class Engine {
         $this->response()->header('ETag', $id);
 
         if ($id === getenv('HTTP_IF_NONE_MATCH')) {
-            $this->halt(304, '', true);
+            $this->halt(304);
         }
     }
 
@@ -453,7 +452,7 @@ class Engine {
         $this->response()->header('Last-Modified', date(DATE_RFC1123, $time));
 
         if ($time === strtotime(getenv('HTTP_IF_MODIFIED_SINCE'))) {
-            $this->halt(304, '', true);
+            $this->halt(304);
         }
     }
 }
diff --git a/flight/net/Response.php b/flight/net/Response.php
index 77a232b..4ce1d00 100644
--- a/flight/net/Response.php
+++ b/flight/net/Response.php
@@ -151,21 +151,19 @@ class Response {
      * @return object Self reference
      */
     public function cache($expires) {
-        if ($expires !== true) {
-            if ($expires === false) {
-                $this->headers['Expires'] = 'Mon, 26 Jul 1997 05:00:00 GMT';
-                $this->headers['Cache-Control'] = array(
-                    'no-store, no-cache, must-revalidate',
-                    'post-check=0, pre-check=0',
-                    'max-age=0'
-                );
-                $this->headers['Pragma'] = 'no-cache';
-            }
-            else {
-                $expires = is_int($expires) ? $expires : strtotime($expires);
-                $this->headers['Expires'] = gmdate('D, d M Y H:i:s', $expires) . ' GMT';
-                $this->headers['Cache-Control'] = 'max-age='.($expires - time());
-            }
+        if ($expires === false) {
+            $this->headers['Expires'] = 'Mon, 26 Jul 1997 05:00:00 GMT';
+            $this->headers['Cache-Control'] = array(
+                'no-store, no-cache, must-revalidate',
+                'post-check=0, pre-check=0',
+                'max-age=0'
+            );
+            $this->headers['Pragma'] = 'no-cache';
+        }
+        else {
+            $expires = is_int($expires) ? $expires : strtotime($expires);
+            $this->headers['Expires'] = gmdate('D, d M Y H:i:s', $expires) . ' GMT';
+            $this->headers['Cache-Control'] = 'max-age='.($expires - time());
         }
 
         return $this;