diff --git a/flight/Engine.php b/flight/Engine.php
index 879d606..7cac51a 100644
--- a/flight/Engine.php
+++ b/flight/Engine.php
@@ -386,9 +386,16 @@ class Engine {
      * @param int $code HTTP status code
      */
     public function _redirect($url, $code = 303) {
-        $base = $this->request()->base;
-        if ($base != '/' && strpos($url, '://') === false) {
-            $url = $base.(($url[0] == '/') ? '' : '/').$url;
+        if ($this->get('flight.base_url') !== null) {
+            $base = $this->get('flight.base_url');
+        }
+        else {
+            $base = $this->request()->base;
+        }
+
+        // Append base to relative urls
+        if ($base != '/' && $url[0] != '/' && strpos($url, '://') === false) {
+            $url = $base.'/'.$url;
         }
 
         $this->response(false)
diff --git a/flight/net/Request.php b/flight/net/Request.php
index c003513..5fc4316 100644
--- a/flight/net/Request.php
+++ b/flight/net/Request.php
@@ -43,7 +43,7 @@ class Request {
         if (empty($config)) {
             $config = array(
                 'url' => getenv('REQUEST_URI') ?: '/',
-                'base' => str_replace('\\', '/', dirname(getenv('SCRIPT_NAME'))),
+                'base' => str_replace(array('\\',' '), array('/','%20'), dirname(getenv('SCRIPT_NAME'))),
                 'method' => getenv('REQUEST_METHOD') ?: 'GET',
                 'referrer' => getenv('HTTP_REFERER') ?: '',
                 'ip' => getenv('REMOTE_ADDR') ?: '',
diff --git a/tests/README.md b/tests/README.md
index 5357acd..fc7ea76 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -1,6 +1,6 @@
 ## Flight Tests
 
-This directory contains unit tests for Flight. The tests were written for PHPUnit 3.7.
+This directory contains unit tests for Flight. The tests were written for PHPUnit 3.7.10
 
 To run the tests do:
 
diff --git a/tests/RedirectTest.php b/tests/RedirectTest.php
new file mode 100644
index 0000000..097cbc8
--- /dev/null
+++ b/tests/RedirectTest.php
@@ -0,0 +1,77 @@
+<?php
+/**
+ * Flight: An extensible micro-framework.
+ *
+ * @copyright   Copyright (c) 2013, Mike Cao <mike@mikecao.com>
+ * @license     MIT, http://flightphp.com/license
+ */
+
+require_once 'PHPUnit/Autoload.php';
+require_once __DIR__.'/../flight/Flight.php';
+
+class RedirectTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \flight\Engine
+     */
+    private $app;
+
+    function getBaseUrl($base, $url){
+        if ($base != '/' && $url[0] != '/' && strpos($url, '://') === false) {
+            return $base.'/'.$url;
+        }
+
+        return $url;
+    }
+
+    function setUp() {
+        putenv('SCRIPT_NAME=/subdir/index.php');
+
+        $this->app = new \flight\Engine();
+        $this->app->set('flight.base_url', '/testdir');
+    }
+
+    // The base should be the subdirectory
+    function testBase(){
+        $base = $this->app->request()->base;
+
+        $this->assertEquals('/subdir', $base);
+    }
+
+    // Absolute URLs should ignore the base
+    function testAbsoluteUrl(){
+        $url = '/login';
+        $base = $this->app->request()->base;
+
+        $this->assertEquals('/login', $this->getBaseUrl($base, $url));
+    }
+
+    // Relative URLs shuold include the base
+    function testRelativeUrl(){
+        $url = 'login';
+        $base = $this->app->request()->base;
+
+        $this->assertEquals('/subdir/login', $this->getBaseUrl($base, $url));
+    }
+
+    // External URLs should ignore the base
+    function testHttpUrl(){
+        $url = 'http://www.yahoo.com';
+        $base = $this->app->request()->base;
+
+        $this->assertEquals('http://www.yahoo.com', $this->getBaseUrl($base, $url));
+    }
+
+    // Configuration should override derived value
+    function testBaseOverride(){
+        $url = 'login';
+        if ($this->app->get('flight.base_url') !== null) {
+            $base = $this->app->get('flight.base_url');
+        }
+        else {
+            $base = $this->app->request()->base;
+        }
+
+        $this->assertEquals('/testdir/login', $this->getBaseUrl($base, $url));
+    }
+}
diff --git a/tests/RequestTest.php b/tests/RequestTest.php
index 807f7ac..54ff9c8 100644
--- a/tests/RequestTest.php
+++ b/tests/RequestTest.php
@@ -17,6 +17,7 @@ class RequestTest extends PHPUnit_Framework_TestCase
 
     function setUp() {
         putenv('REQUEST_URI=/');
+        putenv('SCRIPT_NAME=/index.php');
         putenv('REQUEST_METHOD=GET');
         putenv('HTTP_X_REQUESTED_WITH=XMLHttpRequest');
         putenv('REQUEST_URI=/');
@@ -29,7 +30,7 @@ class RequestTest extends PHPUnit_Framework_TestCase
 
     function testDefaults() {
         $this->assertEquals('/', $this->request->url);
-        $this->assertEquals('', $this->request->base);
+        $this->assertEquals('/', $this->request->base);
         $this->assertEquals('GET', $this->request->method);
         $this->assertEquals('', $this->request->referrer);
         $this->assertEquals(true, $this->request->ajax);