diff --git a/system/uri.php b/system/uri.php
index a901d49..ded5163 100644
--- a/system/uri.php
+++ b/system/uri.php
@@ -1,4 +1,11 @@
 <?php
+/**
+ * @file uri.php
+ * @date 2018-04-13
+ * @author Go Namhyeon <gnh1201@gmail.com>
+ * @brief URI module
+ */
+
 if(!function_exists("base_url")) {
 	function base_url() {
 		return get_config_value("base_url");
@@ -15,7 +22,7 @@ if(!function_exists("get_uri")) {
 	function get_uri() {
 		$requests = get_requests();
 
-		$request_uri = '';
+		$request_uri = "";
 		if(!array_key_empty("REQUEST_URI", $_SERVER)) {
 			$request_uri = $requests["_URI"];
 		}
@@ -24,6 +31,55 @@ if(!function_exists("get_uri")) {
 	}
 }
 
+if(!function_exists("read_requests")) {
+	function read_requests() {
+		$requests = array(
+			"_ALL"   => $_REQUEST,
+			"_POST"  => $_POST,
+			"_GET"   => $_GET,
+			"_URI"   => !array_key_empty("REQUEST_URI", $_SERVER) ? $_SERVER["REQUEST_URI"] : '',
+			"_FILES" => is_array($_FILES) ? $_FILES : array(),
+		);
+
+		// with security module
+		if(function_exists("get_clean_xss")) {
+			foreach($requests['_GET'] as $k=>$v) {
+				if(is_string($v)) {
+					$requests['_GET'][$k] = get_clean_xss($v);
+				}
+			}
+		}
+
+		// set alias
+		$requests['all'] = $requests['_ALL'];
+		$requests['post'] = $requests['_POST'];
+		$requests['get'] = $requests['_GET'];
+		$requests['uri'] = $requests['_URI'];
+		$requests['files'] = $requests['_FILES'];
+
+		return $requests;
+	}
+}
+
+if(!function_exists("get_requests")) {
+	function get_requests() {
+		$requests = get_scope("requests");
+		
+		if(!is_array($requests)) {
+			set_scope("requests", read_requests());
+		}
+
+		return get_scope("requests");
+	}
+}
+
+if(!function_exists("redirect_uri")) {
+	function redirect_uri($uri, $permanent=false) {
+		header("Location: " . $uri, true, $permanent ? 301 : 302);
+		exit();
+	}
+}
+
 if(!function_exists("read_requests")) {
 	function read_requests() {
 		$requests = array(
@@ -54,67 +110,11 @@ if(!function_exists("read_requests")) {
 	}
 }
 
-if(!function_exists("get_requests")) {
-	function get_requests() {
-		global $requests;
-		$requests = is_array($requests) ? $requests : read_requests();
-		return $requests;
-	}
-}
-
-if(!function_exists("redirect_uri")) {
-	function redirect_uri($uri, $permanent=false) {
-		header('Location: ' . $uri, true, $permanent ? 301 : 302);
-		exit();
-	}
-}
-
-if(!function_exists("get_requested_value")) {
-	function get_requested_value($name, $scope="all", $escape_quotes=true, $escape_tags=false) {
-		$requests = get_requests();
-
-		$value = "";
-		$method = "";
-
-		switch($scope) {
-			case "all":
-				$method = "_ALL";
-				break;
-			case "post":
-				$method = "_POST";
-				break;
-			case "get":
-				$method = "_GET";
-				break;
-			default:
-				$method = "";
-		}
-
-		// set validated value
-		if(!empty($method)) {
-			$value = array_key_empty($name, $requests[$method]) ? $value : $requests[$method][$name];
-
-			if(is_string($value)) {
-				// security: set escape quotes
-				if($escape_quotes == true) {
-					$value = addslashes($value);
-				}
-
-				// security: set escape tags
-				if($escape_tags == true) {
-					$value = htmlspecialchars($value);
-				}
-			}
-		}
-
-		return $value;
-	}
-}
-
 if(!function_exists("get_array")) {
 	function get_array($arr) {
 		return is_array($arr) ? $arr : array();
 	}
 }
 
-$requests = read_requests();
+// set scope
+set_scope("requests", read_requests());