diff --git a/framework/caching/Cache.php b/framework/caching/Cache.php
index a35785c..1c5765c 100644
--- a/framework/caching/Cache.php
+++ b/framework/caching/Cache.php
@@ -95,7 +95,7 @@ abstract class Cache extends Component implements \ArrayAccess
 			return (string)$key;
 		} else {
 			$params = func_get_args();
-			return md5(serialize($params));
+			return md5(json_encode($params));
 		}
 	}
 
diff --git a/framework/web/UrlManager.php b/framework/web/UrlManager.php
index 8f927e8..a69385c 100644
--- a/framework/web/UrlManager.php
+++ b/framework/web/UrlManager.php
@@ -9,6 +9,7 @@
 
 namespace yii\web;
 
+use Yii;
 use \yii\base\Component;
 
 /**
@@ -20,69 +21,43 @@ use \yii\base\Component;
 class UrlManager extends Component
 {
 	/**
-	 * @var array the URL rules (pattern=>route).
+	 * @var boolean whether to enable pretty URLs.
+	 */
+	public $enablePrettyUrl = false;
+	/**
+	 * @var array the rules for creating and parsing URLs when [[enablePrettyUrl]] is true.
+	 * This property is used only if [[enablePrettyUrl]] is true. Each element in the array
+	 * is the configuration of creating a single URL rule whose class by default is [[defaultRuleClass]].
+	 * If you modify this property after the UrlManager object is created, make sure
+	 * populate the array with the rule objects instead of configurations.
 	 */
 	public $rules = array();
 	/**
 	 * @var string the URL suffix used when in 'path' format.
-	 * For example, ".html" can be used so that the URL looks like pointing to a static HTML page. Defaults to empty.
+	 * For example, ".html" can be used so that the URL looks like pointing to a static HTML page.
+	 * This property is used only if [[enablePrettyUrl]] is true.
 	 */
 	public $suffix;
 	/**
 	 * @var boolean whether to show entry script name in the constructed URL. Defaults to true.
+	 * This property is used only if [[enablePrettyUrl]] is true.
 	 */
 	public $showScriptName = true;
 	/**
-	 * @var boolean whether to append GET parameters to the path info part. Defaults to true.
-	 * This property is only effective when {@link urlFormat} is 'path' and is mainly used when
-	 * creating URLs. When it is true, GET parameters will be appended to the path info and
-	 * separate from each other using slashes. If this is false, GET parameters will be in query part.
-	 */
-	public $appendParams = true;
-	/**
 	 * @var string the GET variable name for route. Defaults to 'r'.
 	 */
 	public $routeVar = 'r';
 	/**
-	 * @var boolean whether routes are case-sensitive. Defaults to true. By setting this to false,
-	 * the route in the incoming request will be turned to lower case first before further processing.
-	 * As a result, you should follow the convention that you use lower case when specifying
-	 * controller mapping ({@link CWebApplication::controllerMap}) and action mapping
-	 * ({@link CController::actions}). Also, the directory names for organizing controllers should
-	 * be in lower case.
-	 */
-	public $caseSensitive = true;
-	/**
-	 * @var boolean whether the GET parameter values should match the corresponding
-	 * sub-patterns in a rule before using it to create a URL. Defaults to false, meaning
-	 * a rule will be used for creating a URL only if its route and parameter names match the given ones.
-	 * If this property is set true, then the given parameter values must also match the corresponding
-	 * parameter sub-patterns. Note that setting this property to true will degrade performance.
-	 * @since 1.1.0
-	 */
-	public $matchValue = false;
-	/**
-	 * @var string the ID of the cache application component that is used to cache the parsed URL rules.
-	 * Defaults to 'cache' which refers to the primary cache application component.
+	 * @var string the ID of the cache component that is used to cache the parsed URL rules.
+	 * Defaults to 'cache' which refers to the primary cache component registered with the application.
 	 * Set this property to false if you want to disable caching URL rules.
 	 */
 	public $cacheID = 'cache';
 	/**
-	 * @var boolean whether to enable strict URL parsing.
-	 * This property is only effective when {@link urlFormat} is 'path'.
-	 * If it is set true, then an incoming URL must match one of the {@link rules URL rules}.
-	 * Otherwise, it will be treated as an invalid request and trigger a 404 HTTP exception.
-	 * Defaults to false.
+	 * @var string the class name or configuration for URL rule instances.
+	 * This will be passed to [[\Yii::createObject()]] to create the URL rule instances.
 	 */
-	public $useStrictParsing = false;
-	/**
-	 * @var string the class name or path alias for the URL rule instances. Defaults to 'CUrlRule'.
-	 * If you change this to something else, please make sure that the new class must extend from
-	 * {@link CBaseUrlRule} and have the same constructor signature as {@link CUrlRule}.
-	 * It must also be serializable and autoloadable.
-	 * @since 1.1.8
-	 */
-	public $urlRuleClass = 'CUrlRule';
+	public $defaultRuleClass = 'yii\web\UrlRule';
 
 	/**
 	 * Initializes the application component.
@@ -90,29 +65,67 @@ class UrlManager extends Component
 	public function init()
 	{
 		parent::init();
-		$this->processRules();
-	}
 
-	/**
-	 * Processes the URL rules.
-	 */
-	protected function processRules()
-	{
-		foreach ($this->rules as $i => $rule) {
-			if (!isset($rule['class'])) {
-				$rule['class'] = 'yii\web\UrlRule';
+		if ($this->enablePrettyUrl && $this->rules !== array()) {
+			/**
+			 * @var $cache \yii\caching\Cache
+			 */
+			if ($this->cacheID !== false && ($cache = Yii::$app->getComponent($this->cacheID)) !== null) {
+				$key = $cache->buildKey(__CLASS__);
+				$hash = md5(json_encode($this->rules));
+				if (($data = $cache->get($key)) !== false && isset($data[1]) && $data[1] === $hash) {
+					$this->rules = $data[0];
+					return;
+				}
+			}
+
+			foreach ($this->rules as $i => $rule) {
+				if (!isset($rule['class'])) {
+					$rule['class'] = $this->defaultRuleClass;
+				}
+				$this->rules[$i] = Yii::createObject($rule);
+			}
+
+			if (isset($cache)) {
+				$cache->set($key, array($this->rules, $hash));
 			}
-			$this->rules[$i] = \Yii::createObject($rule);
 		}
 	}
 
 	/**
 	 * Parses the user request.
-	 * @param Request $request the request application component
-	 * @return string the route (controllerID/actionID) and perhaps GET parameters in path format.
+	 * @param Request $request the request component
+	 * @return array|boolean the route and the associated parameters. The latter is always empty
+	 * if [[enablePrettyUrl]] is false. False is returned if the current request cannot be successfully parsed.
 	 */
 	public function parseUrl($request)
 	{
+		if ($this->enablePrettyUrl) {
+			$pathInfo = $request->pathInfo;
+			/** @var $rule UrlRule */
+			foreach ($this->rules as $rule) {
+				if (($result = $rule->parseUrl($this, $pathInfo)) !== false) {
+					return $result;
+				}
+			}
+
+			$suffix = (string)$this->suffix;
+			if ($suffix !== '' && $suffix !== '/' && $pathInfo !== '') {
+				$n = strlen($this->suffix);
+				if (substr($pathInfo, -$n) === $this->suffix) {
+					$pathInfo = substr($pathInfo, 0, -$n);
+					if ($pathInfo === '') {
+						// suffix alone is not allowed
+						return false;
+					}
+				}
+			}
+
+			return array($pathInfo, array());
+		} else {
+			$route = (string)$request->getParam($this->routeVar);
+			return array($route, array());
+		}
 	}
 
 	public function createUrl($route, $params = array())
@@ -120,17 +133,27 @@ class UrlManager extends Component
 		$anchor = isset($params['#']) ? '#' . $params['#'] : '';
 		unset($anchor['#']);
 
-		/** @var $rule UrlRule */
-		foreach ($this->rules as $rule) {
-			if (($url = $rule->createUrl($this, $route, $params)) !== false) {
-				return $this->getBaseUrl() . $url . $anchor;
+		$route = trim($route, '/');
+
+		if ($this->enablePrettyUrl) {
+			/** @var $rule UrlRule */
+			foreach ($this->rules as $rule) {
+				if (($url = $rule->createUrl($this, $route, $params)) !== false) {
+					return $this->getBaseUrl() . $url . $anchor;
+				}
 			}
-		}
 
-		if ($params !== array()) {
-			$route .= '?' . http_build_query($params);
+			if ($this->suffix !== null) {
+				$route .= $this->suffix;
+			}
+			if ($params !== array()) {
+				$route .= '?' . http_build_query($params);
+			}
+			return $this->getBaseUrl() . '/' . $route . $anchor;
+		} else {
+			$params[$this->routeVar] = $route;
+			return $this->getBaseUrl() . '?' . http_build_query($params) . $anchor;
 		}
-		return $this->getBaseUrl() . '/' . $route . $anchor;
 	}
 
 	private $_baseUrl;
diff --git a/framework/web/UrlRule.php b/framework/web/UrlRule.php
index 471712b..97214c9 100644
--- a/framework/web/UrlRule.php
+++ b/framework/web/UrlRule.php
@@ -56,11 +56,6 @@ class UrlRule extends Object
 	 */
 	public $verb;
 	/**
-	 * @var string the host info (e.g. `http://www.example.com`) that this rule should match.
-	 * If not set, it means the host info is ignored.
-	 */
-	public $hostInfo;
-	/**
 	 * @var integer a value indicating if this rule should be used for both URL parsing and creation,
 	 * parsing only, or creation only.
 	 * If not set, it means the rule is both URL parsing and creation.