diff --git a/LICENSE b/LICENSE
old mode 100644
new mode 100755
diff --git a/README.md b/README.md
old mode 100644
new mode 100755
diff --git a/mirzaev/minimal/system/controller.php b/mirzaev/minimal/system/controller.php
index 93fc563..b08a0c2 100755
--- a/mirzaev/minimal/system/controller.php
+++ b/mirzaev/minimal/system/controller.php
@@ -11,12 +11,15 @@ use mirzaev\minimal\model,
 	mirzaev\minimal\http\request,
 	mirzaev\minimal\http\enumerations\status;
 
-// Build-in libraries
-use exception;
+// Built-in libraries
+use exception,
+	RuntimeException as exception_runtime;
 
 /**
  * Controller
  *
+ * @package mirzaev\minimal
+ *
  * @var core $core An instance of the core
  * @var request $request Request
  * @var model $model An instance of the model connected in the core
@@ -24,8 +27,6 @@ use exception;
  *
  * @method void __construct(core $core) Constructor
  *
- * @package mirzaev\minimal
- *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
@@ -56,12 +57,32 @@ class controller
 	/**
 	 * Model
 	 *
+	 * @throws exception_runtime if reinitialize the property
+	 * @throws exception_runtime if an attempt to write null
+	 *
 	 * @var model $model An instance of the model connected in the core
 	 */
-	public model $model {
+	public ?model $model = null {
 		// Write
-		set (model $model) {
-				$this->model ??= $model;
+		set (model|null $model) {
+			if (isset($this->{__PROPERTY__})) {
+				// The property is already initialized
+
+				// Exit (fail)
+				throw new exception_runtime('The property is already initialized: ' . __PROPERTY__, status::internal_server_error->value);
+			}
+
+			if ($model instanceof model) {
+				// Validated model
+
+				// Writing
+				$this->model = $model;
+			} else {
+				// Not validated model
+	
+				// Exit (fail)
+				throw new exception_runtime('The property must be an instance of model', status::internal_server_error->value);
+			}
 		}
 
 		// Read
diff --git a/mirzaev/minimal/system/core.php b/mirzaev/minimal/system/core.php
index 0349479..3776aea 100755
--- a/mirzaev/minimal/system/core.php
+++ b/mirzaev/minimal/system/core.php
@@ -15,6 +15,7 @@ use mirzaev\minimal\router,
 
 // Built-in libraries
 use exception,
+	RuntimeException as exception_runtime,
 	BadMethodCallException as exception_method,
 	DomainException as exception_domain,
 	InvalidArgumentException as exception_argument,
@@ -25,6 +26,8 @@ use exception,
 /**
  * Core
  *
+ * @package mirzaev\minimal
+ *
  * @param string $namespace Namespace where the core was initialized from
  * @param controller $controller An instance of the controller
  * @param model $model An instance of the model
@@ -36,8 +39,6 @@ use exception,
  * @method string|null request(request $request, array $parameters = []) Handle request
  * @method string|null route(route $route, string $method) Handle route
  *
- * @package mirzaev\minimal
- *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
@@ -193,6 +194,9 @@ final class core
 		// Deinitializing name of the controller class
 		unset($controller);
 
+		if (!isset($route->controller->model)) {
+		//
+
 		// Initializing name if the model class
 		$model = $route->model;
 
@@ -219,6 +223,7 @@ final class core
 			// Writing the model to the controller
 			$route->controller->model = $route->model;
 		}
+}
 
 		// Writing the request to the controller
 		$route->controller->request = $request;
@@ -226,8 +231,16 @@ final class core
 		if (method_exists($route->controller, $route->method)) {
 			// Found the method of the controller
 
-			// Executing method of the controller and exit (success)
-			return $route->controller->{$route->method}(...($route->parameters + $request->parameters));
+			try {
+				// Executing method of the controller and exit (success)
+				return $route->controller->{$route->method}(...($route->parameters + $request->parameters));
+			} catch (exception $e) {
+				// Catched an exception
+
+				// Exit (fail)
+				throw new exception_runtime(...$e);
+			}
+
 		} else {
 			// Not found the method of the controller
 		
diff --git a/mirzaev/minimal/system/http/enumerations/content.php b/mirzaev/minimal/system/http/enumerations/content.php
old mode 100644
new mode 100755
index f67585c..f9cce57
--- a/mirzaev/minimal/system/http/enumerations/content.php
+++ b/mirzaev/minimal/system/http/enumerations/content.php
@@ -4,6 +4,13 @@ declare(strict_types=1);
 
 namespace mirzaev\minimal\http\enumerations;
 
+// Files of the project
+use mirzaev\minimal\http\enumerations\status;
+
+// Built-in libraries
+use InvalidArgumentException as exception_argument,
+	DomainException as exception_domain;
+
 /**
  * Content
  *
@@ -18,7 +25,7 @@ enum content: string
 {
 	case any = '*/*';
 
-	// Text
+		// Text
 
 	case txt = 'text/plain';
 	case css = 'text/css';
@@ -26,7 +33,7 @@ enum content: string
 	case html = 'text/html';
 	case js = 'text/javascript'; // js + mjs (https://www.rfc-editor.org/rfc/rfc9239#name-text-javascript)
 
-	// Applications
+		// Applications
 
 	case binary = 'application/octet-stream';
 	case encoded = 'application/x-www-form-urlencoded';
@@ -49,7 +56,7 @@ enum content: string
 	case sh = 'application/x-sh';
 	case xhtml = 'application/xhtml+xml';
 
-	// Audio
+		// Audio
 
 	case aac = 'audio/aac';
 	case mp3 = 'audio/mpeg';
@@ -57,8 +64,8 @@ enum content: string
 	case oga = 'audio/ogg';
 	case weba = 'audio/webm';
 
-	// Images
-	
+		// Images
+
 	case gif = 'image/gif';
 	case jpeg = 'image/jpeg';
 	case png = 'image/png';
@@ -70,25 +77,46 @@ enum content: string
 	case bmp = 'image/bmp';
 	case ico = 'image/vnd.microsoft.icon';
 
-	// Videos
-	
+		// Videos
+
 	case avi = 'video/x-msvideo';
 	case mp4 = 'video/mp4';
 	case mpeg = 'video/mpeg';
 	case ogv = 'video/ogg';
 	case ts = 'video/mp2t';
 
-	// Fonts
-	
+		// Fonts
+
 	case otf = 'font/otf';
 	case ttf = 'font/ttf';
 	case woff = 'font/woff';
 	case woff2 = 'font/woff2';
 
-	// Multipart
-	
+		// Multipart
+
 	case form = 'multipart/form-data';
 	case mixed = 'multipart/mixed';
 	case alternative = 'multipart/alternative';
 	case related = 'multipart/related';
+
+	/**
+	 * Extension
+	 *
+	 * Returns the file extension without a dot
+	 *
+	 * @throws exception_argument if content can not have file extension
+	 * @throws exception_domain if failed to recognize content
+	 *
+	 * @return string File extension
+	 */
+	public function extension(): string
+	{
+		// Exit (success)
+		return match ($this) {
+			self::jpeg => 'jpg',
+			self::png => 'png',
+			self::form, self::mixed, self::alternative, self::related => throw new exception_argument('Content can not have file extension', status::internal_server_error->value),
+			default => throw new exception_domain('Failed to recognize content: ' . $this->value, status::not_found->value)
+		};
+	}
 }
diff --git a/mirzaev/minimal/system/http/enumerations/method.php b/mirzaev/minimal/system/http/enumerations/method.php
old mode 100644
new mode 100755
diff --git a/mirzaev/minimal/system/http/enumerations/protocol.php b/mirzaev/minimal/system/http/enumerations/protocol.php
old mode 100644
new mode 100755
index 29912d8..dc9b784
--- a/mirzaev/minimal/system/http/enumerations/protocol.php
+++ b/mirzaev/minimal/system/http/enumerations/protocol.php
@@ -16,9 +16,9 @@ namespace mirzaev\minimal\http\enumerations;
  */
 enum protocol: string
 {
-	case HTTP_3 = 'HTTP/3';
-	case HTTP_2 = 'HTTP/2';
-	case HTTP_1_1 = 'HTTP/1.1';
-	case HTTP_1_0 = 'hTTP/1.0';
-	case HTTP_0_9 = 'HTTP/0.9';
+	case http_3 = 'HTTP/3';
+	case http_2 = 'HTTP/2';
+	case http_1_1 = 'HTTP/1.1';
+	case http_1 = 'hTTP/1.0';
+	case http_0_9 = 'HTTP/0.9';
 }
diff --git a/mirzaev/minimal/system/http/enumerations/status.php b/mirzaev/minimal/system/http/enumerations/status.php
old mode 100644
new mode 100755
diff --git a/mirzaev/minimal/system/http/request.php b/mirzaev/minimal/system/http/request.php
index 02b5c14..ba6d466 100755
--- a/mirzaev/minimal/system/http/request.php
+++ b/mirzaev/minimal/system/http/request.php
@@ -20,6 +20,8 @@ use DomainException as exception_domain,
 /**
  * Request
  *
+ * @package mirzaev\minimal\http
+ *
  * @param method $method Method
  * @param string $uri URI
  * @param protocol $protocol Version of HTTP protocol
@@ -32,8 +34,6 @@ use DomainException as exception_domain,
  * @method response response() Generate response for request
  * @method self header(string $name, string $value) Write a header to the headers property
  *
- * @package mirzaev\minimal\http
- *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
diff --git a/mirzaev/minimal/system/http/response.php b/mirzaev/minimal/system/http/response.php
index c1ae4b7..3f6f31b 100755
--- a/mirzaev/minimal/system/http/response.php
+++ b/mirzaev/minimal/system/http/response.php
@@ -20,6 +20,8 @@ use DomainException as exception_domain,
 /**
  * Response
  *
+ * @package mirzaev\minimal\http
+ *
  * @param protocol $protocol Version of HTTP protocol
  * @param status $status Status
  * @param array $headers Headers
@@ -37,8 +39,6 @@ use DomainException as exception_domain,
  * @method self clean() Delete everything in the output buffer
  * @method self end() Initializes response headers and flushes the output buffer
  *
- * @package mirzaev\minimal\http
- *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
@@ -49,7 +49,6 @@ final class response
 	 *
 	 * @see https://wiki.php.net/rfc/property-hooks (find a table about backed and virtual hooks)
 	 * 
-	 * @throws exception_runtime if reinitialize the property
 	 * @throws exception_domain if failed to recognize HTTP version
 	 *
 	 * @var protocol $protocol Version of HTTP protocol
@@ -57,12 +56,6 @@ final class response
 	public protocol $protocol {
 		// Write
 		set (protocol|string $value) {
-			if (isset($this->{__PROPERTY__})) {
-				// The property is already initialized
-
-				// Exit (fail)
-				throw new exception_runtime('The property is already initialized: ' . __PROPERTY__, status::internal_server_error->value);
-			}
 
 			if ($value instanceof protocol) {
 				// Received implementation of HTTP version
@@ -95,7 +88,6 @@ final class response
 	 *
 	 * @see https://wiki.php.net/rfc/property-hooks (find a table about backed and virtual hooks)
 	 * 
-	 * @throws exception_runtime if reinitialize the property
 	 * @throws exception_domain if failed to recognize status
 	 *
 	 * @var status $status Status
@@ -103,12 +95,6 @@ final class response
 	public status $status {
 		// Write
 		set (status|string $value) {
-			if (isset($this->{__PROPERTY__})) {
-				// The property is already initialized
-
-				// Exit (fail)
-				throw new exception_runtime('The property is already initialized: ' . __PROPERTY__, status::internal_server_error->value);
-			}
 
 			if ($value instanceof status) {
 				// Received implementation of status
@@ -161,10 +147,10 @@ final class response
 		set (string $value) {
 			// Writing
 			$this->body = $value;
-		};
+		}
 
 		// Read
-		&get => $this->body;
+		get => $this->body;
 	}
 
 	/**
@@ -353,12 +339,42 @@ final class response
 	 *
 	 * Generates the status line (HTTP/2 200 OK)
 	 *
+	 * @param protocol|null $protocol Version of HTTP
+	 * @param status|null $status Status code and status text
+	 *
 	 * @return string The status line
 	 */
-	public function status(): string 
+	public function status(?protocol $protocol = null, ?status $status = null): string 
 	{
+		// Declaring buffer of status line
+		$buffer = '';
+
+		if ($protocol instanceof protocol) {
+			// Received version of HTTP
+
+			// Writing to buffer of status line
+			$buffer .= $protocol->value . ' ';
+		} else {
+			// Not received version of HTTP
+
+			// Writing to buffer of status line
+			$buffer .= $this->protocol->value . ' ';
+		}
+
+		if ($status instanceof status) {
+			// Received status
+
+			// Writing to buffer of status line
+			$buffer .= $status->value . ' ' . $status->label();
+		} else {
+			// Not received status
+
+			// Writing to buffer of status line
+			$buffer .= $this->status->value . ' ' . $this->status->label();
+		}
+
 		// Exit (success)
-		return $this->protocol->value . ' ' . $this->status->value . ' ' . $this->status->label();
+		return $buffer;
 	}
 
   /**
diff --git a/mirzaev/minimal/system/model.php b/mirzaev/minimal/system/model.php
index 2a39b95..02a92fc 100755
--- a/mirzaev/minimal/system/model.php
+++ b/mirzaev/minimal/system/model.php
@@ -10,10 +10,10 @@ use	mirzaev\minimal\traits\magic;
 /**
  * Model
  *
- * @method void __construct() Constructor
- *
  * @package mirzaev\minimal
  *
+ * @method void __construct() Constructor
+ *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
diff --git a/mirzaev/minimal/system/route.php b/mirzaev/minimal/system/route.php
index d88aad9..8a556da 100755
--- a/mirzaev/minimal/system/route.php
+++ b/mirzaev/minimal/system/route.php
@@ -7,6 +7,8 @@ namespace mirzaev\minimal;
 /**
  * Route
  *
+ * @package mirzaev\minimal
+ *
  * @param string|controller $controller Name of the controller
  * @param string $method Name of the method of the method of $this->controller
  * @param string|model $model Name of the model
@@ -15,8 +17,6 @@ namespace mirzaev\minimal;
  *
  * @method void __construct(string|controller $controller, ?string $method, string|model|null $model, array $parameters, array $options) Constructor
  *
- * @package mirzaev\minimal
- *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
diff --git a/mirzaev/minimal/system/router.php b/mirzaev/minimal/system/router.php
index 85755db..b28ade4 100755
--- a/mirzaev/minimal/system/router.php
+++ b/mirzaev/minimal/system/router.php
@@ -15,6 +15,8 @@ use InvalidArgumentException as exception_argument;
 /**
  * Router
  *
+ * @package mirzaev\minimal
+ *
  * @param array $routes Registry of routes
  *
  * @method self write(string $urn, route $route, string|array $method) Write route to registry of routes (fluent interface)
@@ -22,8 +24,6 @@ use InvalidArgumentException as exception_argument;
  * @method self sort() Sort routes (DEV)
  * @method string universalize(string $urn) Universalize URN
  *
- * @package mirzaev\minimal
- *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
diff --git a/mirzaev/minimal/system/traits/magic.php b/mirzaev/minimal/system/traits/magic.php
index 6b29e40..0defbbf 100755
--- a/mirzaev/minimal/system/traits/magic.php
+++ b/mirzaev/minimal/system/traits/magic.php
@@ -13,13 +13,13 @@ use exception;
 /**
  * Trait of magical methods
  *
+ * @package mirzaev\minimal\traits
+ *
  * @method void __set(string $name, mixed $value) Write property
  * @method mixed __get(string $name) Read property
  * @method void __unset(string $name) Delete property
  * @method bool __isset(string $name) Check property for initialization
  *
- * @package mirzaev\minimal\traits
- *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
diff --git a/mirzaev/minimal/system/traits/singleton.php b/mirzaev/minimal/system/traits/singleton.php
old mode 100644
new mode 100755
index cf25e17..1ea7a12
--- a/mirzaev/minimal/system/traits/singleton.php
+++ b/mirzaev/minimal/system/traits/singleton.php
@@ -10,10 +10,10 @@ use exception;
 /**
  * Trait of singleton
  *
- * @method static initialize() Initialize an instance
- *
  * @package mirzaev\minimal\traits
  *
+ * @method static initialize() Initialize an instance
+ *
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */