diff --git a/framework/YiiBase.php b/framework/YiiBase.php
index d57c92d..3de9bd8 100644
--- a/framework/YiiBase.php
+++ b/framework/YiiBase.php
@@ -63,7 +63,7 @@ class YiiBase
 	 */
 	public static $classPath = array();
 	/**
-	 * @var yii\base\Application the application instance
+	 * @var yii\console\Application|yii\web\Application the application instance
 	 */
 	public static $app;
 	/**
diff --git a/framework/base/Application.php b/framework/base/Application.php
index 468494c..5fd0401 100644
--- a/framework/base/Application.php
+++ b/framework/base/Application.php
@@ -398,8 +398,6 @@ class Application extends Module
 	public function registerDefaultAliases()
 	{
 		Yii::$aliases['@app'] = $this->getBasePath();
-		Yii::$aliases['@entry'] = dirname($_SERVER['SCRIPT_FILENAME']);
-		Yii::$aliases['@www'] = '';
 	}
 
 	/**
diff --git a/framework/base/Request.php b/framework/base/Request.php
index 9db85a3..06d4c06 100644
--- a/framework/base/Request.php
+++ b/framework/base/Request.php
@@ -13,12 +13,18 @@ namespace yii\base;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class Request extends Component
+abstract class Request extends Component
 {
 	private $_scriptFile;
 	private $_isConsoleRequest;
 
 	/**
+	 * Resolves the current request into a route and the associated parameters.
+	 * @return array the first element is the route, and the second is the associated parameters.
+	 */
+	abstract public function resolve();
+
+	/**
 	 * Returns a value indicating whether the current request is made via command line
 	 * @return boolean the value indicating whether the current request is made via console
 	 */
diff --git a/framework/console/Request.php b/framework/console/Request.php
index 5af2d4f..5fae031 100644
--- a/framework/console/Request.php
+++ b/framework/console/Request.php
@@ -22,6 +22,10 @@ class Request extends \yii\base\Request
 		return isset($_SERVER['argv']) ? $_SERVER['argv'] : array();
 	}
 
+	/**
+	 * Resolves the current request into a route and the associated parameters.
+	 * @return array the first element is the route, and the second is the associated parameters.
+	 */
 	public function resolve()
 	{
 		$rawParams = $this->getRawParams();
diff --git a/framework/web/Application.php b/framework/web/Application.php
index 92686e4..a7e019e 100644
--- a/framework/web/Application.php
+++ b/framework/web/Application.php
@@ -23,7 +23,7 @@ class Application extends \yii\base\Application
 	public function registerDefaultAliases()
 	{
 		parent::registerDefaultAliases();
-		\Yii::$aliases['@www'] = dirname($_SERVER['SCRIPT_FILENAME']);
+		\Yii::$aliases['@webroot'] = dirname($_SERVER['SCRIPT_FILENAME']);
 	}
 
 	/**
@@ -32,8 +32,8 @@ class Application extends \yii\base\Application
 	 */
 	public function processRequest()
 	{
-		$route = $this->getUrlManager()->parseRequest($this->getRequest());
-		return $this->runAction($route, $_GET);
+		list ($route, $params) = $this->getRequest()->resolve();
+		return $this->runAction($route, $params);
 	}
 
 	/**
@@ -46,6 +46,24 @@ class Application extends \yii\base\Application
 	}
 
 	/**
+	 * Returns the response component.
+	 * @return Response the response component
+	 */
+	public function getResponse()
+	{
+		return $this->getComponent('response');
+	}
+
+	/**
+	 * Returns the session component.
+	 * @return Session the session component
+	 */
+	public function getSession()
+	{
+		return $this->getComponent('session');
+	}
+
+	/**
 	 * @return UrlManager
 	 */
 	public function getUrlManager()
diff --git a/framework/web/Request.php b/framework/web/Request.php
index 3d7ebc1..a4a1fb9 100644
--- a/framework/web/Request.php
+++ b/framework/web/Request.php
@@ -10,6 +10,7 @@
 namespace yii\web;
 
 use Yii;
+use yii\base\HttpException;
 use yii\base\InvalidConfigException;
 
 /**
@@ -38,6 +39,25 @@ class Request extends \yii\base\Request
 	private $_cookies;
 
 	/**
+	 * Resolves the current request into a route and the associated parameters.
+	 * @return array the first element is the route, and the second is the associated parameters.
+	 * @throws HttpException if the request cannot be resolved.
+	 */
+	public function resolve()
+	{
+		Yii::setAlias('@www', $this->getBaseUrl());
+
+		$result = Yii::$app->getUrlManager()->parseRequest($this);
+		if ($result !== false) {
+			list ($route, $params) = $result;
+			$params = array_merge($_GET, $params);
+			return array($route, $params);
+		} else {
+			throw new HttpException(404, Yii::t('yii|Page not found.'));
+		}
+	}
+
+	/**
 	 * Returns the method of the current request (e.g. GET, POST, HEAD, PUT, DELETE).
 	 * @return string request method, such as GET, POST, HEAD, PUT, DELETE.
 	 * The value returned is turned into upper case.