diff --git a/.gitignore b/.gitignore
index 832a890..13fcf4a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,4 +13,7 @@ nbproject
 Thumbs.db
 
 # composer vendor dir
-/yii/vendor
\ No newline at end of file
+/yii/vendor
+
+# composer itself is not needed
+composer.phar
diff --git a/composer.json b/composer.json
index e9c3927..e89c27b 100644
--- a/composer.json
+++ b/composer.json
@@ -69,11 +69,26 @@
 	"bin": [
 		"yii/yiic"
 	],
+	"repositories": [
+		{
+			"type": "package",
+			"package": {
+				"name": "bestiejs/punycode.js",
+				"version": "1.2.1",
+				"source": {
+					"url": "git://github.com/bestiejs/punycode.js.git",
+					"type": "git",
+					"reference": "1.2.1"
+				}
+			}
+		}
+	],
 	"require": {
 		"php": ">=5.3.0",
 		"michelf/php-markdown": "1.3",
 		"twig/twig": "1.12.*",
 		"smarty/smarty": "3.1.*",
-		"ezyang/htmlpurifier": "v4.5.0"
+		"ezyang/htmlpurifier": "v4.5.0",
+		"bestiejs/punycode.js": "1.2.1"
 	}
 }
diff --git a/composer.lock b/composer.lock
index 1cae3d4..18a46ee 100644
--- a/composer.lock
+++ b/composer.lock
@@ -3,9 +3,19 @@
         "This file locks the dependencies of your project to a known state",
         "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file"
     ],
-    "hash": "7d46ce9c4d8d5f4ecae1611ea8f0b49c",
+    "hash": "a8f949e337a229a4cfb41496a0071ef6",
     "packages": [
         {
+            "name": "bestiejs/punycode.js",
+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "git://github.com/bestiejs/punycode.js.git",
+                "reference": "1.2.1"
+            },
+            "type": "library"
+        },
+        {
             "name": "ezyang/htmlpurifier",
             "version": "v4.5.0",
             "source": {
diff --git a/tests/unit/framework/web/ResponseTest.php b/tests/unit/framework/web/ResponseTest.php
new file mode 100644
index 0000000..b3d9080
--- /dev/null
+++ b/tests/unit/framework/web/ResponseTest.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace yii\web;
+
+use yiiunit\framework\web\ResponseTest;
+
+/**
+ * Mock PHP header function to check for sent headers
+ * @param string $string
+ * @param bool $replace
+ * @param int $httpResponseCode
+ */
+function header($string, $replace = true, $httpResponseCode = null) {
+	ResponseTest::$headers[] = $string;
+	// TODO implement replace
+
+	if ($httpResponseCode !== null) {
+		ResponseTest::$httpResponseCode = $httpResponseCode;
+	}
+}
+
+namespace yiiunit\framework\web;
+
+use yii\helpers\StringHelper;
+use yii\web\Response;
+
+class ResponseTest extends \yiiunit\TestCase
+{
+	public static $headers = array();
+	public static $httpResponseCode = 200;
+
+	protected function setUp()
+	{
+		parent::setUp();
+		$this->reset();
+	}
+
+	protected function reset()
+	{
+		static::$headers = array();
+		static::$httpResponseCode = 200;
+	}
+
+	public function ranges()
+	{
+		// TODO test more cases for range requests and check for rfc compatibility
+		// http://www.w3.org/Protocols/rfc2616/rfc2616.txt
+		return array(
+			array('0-5', '0-5', 6, '12ёж'),
+			array('2-', '2-66', 65, 'ёжик3456798áèabcdefghijklmnopqrstuvwxyz!"§$%&/(ёжик)=?'),
+			array('-12', '55-66', 12, '(ёжик)=?'),
+		);
+	}
+
+	/**
+	 * @dataProvider ranges
+	 */
+	public function testSendFileRanges($rangeHeader, $expectedHeader, $length, $expectedFile)
+	{
+		$content = $this->generateTestFileContent();
+
+		$_SERVER['HTTP_RANGE'] = 'bytes=' . $rangeHeader;
+		$sent = $this->runSendFile('testFile.txt', $content, null);
+		$this->assertEquals($expectedFile, $sent);
+		$this->assertTrue(in_array('HTTP/1.1 206 Partial Content', static::$headers));
+		$this->assertTrue(in_array('Accept-Ranges: bytes', static::$headers));
+		$this->assertArrayHasKey('Content-Range: bytes ' . $expectedHeader . '/' . StringHelper::strlen($content), array_flip(static::$headers));
+		$this->assertTrue(in_array('Content-Type: text/plain', static::$headers));
+		$this->assertTrue(in_array('Content-Length: ' . $length, static::$headers));
+	}
+
+	protected function generateTestFileContent()
+	{
+		return '12ёжик3456798áèabcdefghijklmnopqrstuvwxyz!"§$%&/(ёжик)=?';
+	}
+
+	protected function runSendFile($fileName, $content, $mimeType)
+	{
+		ob_start();
+		ob_implicit_flush(false);
+		$response = new Response();
+		$response->sendFile($fileName, $content, $mimeType, false);
+		$file = ob_get_clean();
+		return $file;
+	}
+}
\ No newline at end of file
diff --git a/yii/assets.php b/yii/assets.php
index 7ee177d..746bf30 100644
--- a/yii/assets.php
+++ b/yii/assets.php
@@ -26,7 +26,7 @@ return array(
 		'js' => array(
 			'yii.activeForm.js',
 		),
-		'depends' => array('yii', 'yii/validation'),
+		'depends' => array('yii'),
 	),
 	'yii/captcha' => array(
 		'sourcePath' => __DIR__ . '/assets',
@@ -42,4 +42,10 @@ return array(
 		),
 		'depends' => array('yii'),
 	),
+	'punycode' => array(
+		'sourcePath' => __DIR__ . '/vendor/bestiejs/punycode.js',
+		'js' => array(
+			'punycode.min.js',
+		),
+	),
 );
diff --git a/yii/assets/yii.validation.js b/yii/assets/yii.validation.js
index 5fa8492..2748a74 100644
--- a/yii/assets/yii.validation.js
+++ b/yii/assets/yii.validation.js
@@ -110,9 +110,19 @@ yii.validation = (function ($) {
 				return;
 			}
 
-			var valid = value.match(options.pattern) && (!options.allowName || value.match(options.fullPattern));
+			var valid = true;
+
+			if (options.enableIDN) {
+				var regexp = /^(.*)@(.*)$/,
+					matches = regexp.exec(value);
+				if (matches === null) {
+					valid = false;
+				} else {
+					value = punycode.toASCII(matches[1]) + '@' + punycode.toASCII(matches[2]);
+				}
+			}
 
-			if (!valid) {
+			if (!valid || !(value.match(options.pattern) && (!options.allowName || value.match(options.fullPattern)))) {
 				messages.push(options.message);
 			}
 		},
@@ -126,7 +136,19 @@ yii.validation = (function ($) {
 				value = options.defaultScheme + '://' + value;
 			}
 
-			if (!value.match(options.pattern)) {
+			var valid = true;
+
+			if (options.enableIDN) {
+				var regexp = /^([^:]+):\/\/([^\/]+)(.*)$/,
+					matches = regexp.exec(value);
+				if (matches === null) {
+					valid = false;
+				} else {
+					value = matches[1] + '://' + punycode.toASCII(matches[2]) + matches[3];
+				}
+			}
+
+			if (!valid || !value.match(options.pattern)) {
 				messages.push(options.message);
 			}
 		},
diff --git a/yii/base/ErrorHandler.php b/yii/base/ErrorHandler.php
index 44c2ca0..8340723 100644
--- a/yii/base/ErrorHandler.php
+++ b/yii/base/ErrorHandler.php
@@ -75,8 +75,11 @@ class ErrorHandler extends Component
 			\Yii::$app->runAction($this->errorAction);
 		} elseif (\Yii::$app instanceof \yii\web\Application) {
 			if (!headers_sent()) {
-				$errorCode = $exception instanceof HttpException ? $exception->statusCode : 500;
-				header("HTTP/1.0 $errorCode " . get_class($exception));
+				if ($exception instanceof HttpException) {
+					header('HTTP/1.0 ' . $exception->statusCode . ' ' . $exception->getName());
+				} else {
+					header('HTTP/1.0 500 ' . get_class($exception));
+				}
 			}
 			if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] === 'XMLHttpRequest') {
 				\Yii::$app->renderException($exception);
diff --git a/yii/validators/BooleanValidator.php b/yii/validators/BooleanValidator.php
index 2929dfd..67a64f6 100644
--- a/yii/validators/BooleanValidator.php
+++ b/yii/validators/BooleanValidator.php
@@ -79,9 +79,11 @@ class BooleanValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$options = array(
 			'trueValue' => $this->trueValue,
@@ -100,6 +102,7 @@ class BooleanValidator extends Validator
 			$options['strict'] = 1;
 		}
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.boolean(value, messages, ' . json_encode($options) . ');';
 	}
 }
diff --git a/yii/validators/CaptchaValidator.php b/yii/validators/CaptchaValidator.php
index c49ffdb..dbc263e 100644
--- a/yii/validators/CaptchaValidator.php
+++ b/yii/validators/CaptchaValidator.php
@@ -91,9 +91,11 @@ class CaptchaValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$captcha = $this->getCaptchaAction();
 		$code = $captcha->getVerifyCode(false);
@@ -111,6 +113,7 @@ class CaptchaValidator extends Validator
 			$options['skipOnEmpty'] = 1;
 		}
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.captcha(value, messages, ' . json_encode($options) . ');';
 	}
 }
diff --git a/yii/validators/CompareValidator.php b/yii/validators/CompareValidator.php
index 7f7318f..b8e8a50 100644
--- a/yii/validators/CompareValidator.php
+++ b/yii/validators/CompareValidator.php
@@ -178,9 +178,11 @@ class CompareValidator extends Validator
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated
 	 * @return string the client-side validation script
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @throws InvalidConfigException if CompareValidator::operator is invalid
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$options = array('operator' => $this->operator);
 
@@ -203,6 +205,7 @@ class CompareValidator extends Validator
 			'{compareValue}' => $compareValue,
 		)));
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.compare(value, messages, ' . json_encode($options) . ');';
 	}
 }
diff --git a/yii/validators/EmailValidator.php b/yii/validators/EmailValidator.php
index dce6c37..4297f12 100644
--- a/yii/validators/EmailValidator.php
+++ b/yii/validators/EmailValidator.php
@@ -47,6 +47,12 @@ class EmailValidator extends Validator
 	 * Defaults to false.
 	 */
 	public $checkPort = false;
+	/**
+	 * @var boolean whether validation process should take into account IDN (internationalized domain
+	 * names). Defaults to false meaning that validation of emails containing IDN will always fail.
+	 */
+	public $enableIDN = false;
+
 
 	/**
 	 * Initializes the validator.
@@ -81,10 +87,18 @@ class EmailValidator extends Validator
 	public function validateValue($value)
 	{
 		// make sure string length is limited to avoid DOS attacks
-		$valid = is_string($value) && strlen($value) <= 254
-			&& (preg_match($this->pattern, $value) || $this->allowName && preg_match($this->fullPattern, $value));
+		if (!is_string($value) || strlen($value) >= 255) {
+			return false;
+		}
+		if (($atPosition = strpos($value, '@')) === false) {
+			return false;
+		}
+		$domain = rtrim(substr($value, $atPosition + 1), '>');
+		if ($this->enableIDN) {
+			$value = idn_to_ascii(ltrim(substr($value, 0, $atPosition), '<')) . '@' . idn_to_ascii($domain);
+		}
+		$valid = preg_match($this->pattern, $value) || $this->allowName && preg_match($this->fullPattern, $value);
 		if ($valid) {
-			$domain = rtrim(substr($value, strpos($value, '@') + 1), '>');
 			if ($this->checkMX && function_exists('checkdnsrr')) {
 				$valid = checkdnsrr($domain, 'MX');
 			}
@@ -99,9 +113,11 @@ class EmailValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$options = array(
 			'pattern' => new JsExpression($this->pattern),
@@ -111,11 +127,16 @@ class EmailValidator extends Validator
 				'{attribute}' => $object->getAttributeLabel($attribute),
 				'{value}' => $object->$attribute,
 			))),
+			'enableIDN' => (boolean)$this->enableIDN,
 		);
 		if ($this->skipOnEmpty) {
 			$options['skipOnEmpty'] = 1;
 		}
 
+		$view->registerAssetBundle('yii/validation');
+		if ($this->enableIDN) {
+			$view->registerAssetBundle('punycode');
+		}
 		return 'yii.validation.email(value, messages, ' . Json::encode($options) . ');';
 	}
 }
diff --git a/yii/validators/InlineValidator.php b/yii/validators/InlineValidator.php
index 8af5bbc..dd951aa 100644
--- a/yii/validators/InlineValidator.php
+++ b/yii/validators/InlineValidator.php
@@ -79,12 +79,14 @@ class InlineValidator extends Validator
 	 *
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script. Null if the validator does not support
 	 * client-side validation.
 	 * @see enableClientValidation
 	 * @see \yii\web\ActiveForm::enableClientValidation
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		if ($this->clientValidate !== null) {
 			$method = $this->clientValidate;
diff --git a/yii/validators/NumberValidator.php b/yii/validators/NumberValidator.php
index 33822bf..3bcc6ce 100644
--- a/yii/validators/NumberValidator.php
+++ b/yii/validators/NumberValidator.php
@@ -114,9 +114,11 @@ class NumberValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$label = $object->getAttributeLabel($attribute);
 		$value = $object->$attribute;
@@ -149,6 +151,7 @@ class NumberValidator extends Validator
 			$options['skipOnEmpty'] = 1;
 		}
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.number(value, messages, ' . Json::encode($options) . ');';
 	}
 }
diff --git a/yii/validators/RangeValidator.php b/yii/validators/RangeValidator.php
index 4bed303..a915275 100644
--- a/yii/validators/RangeValidator.php
+++ b/yii/validators/RangeValidator.php
@@ -81,9 +81,11 @@ class RangeValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$range = array();
 		foreach ($this->range as $value) {
@@ -101,6 +103,7 @@ class RangeValidator extends Validator
 			$options['skipOnEmpty'] = 1;
 		}
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.range(value, messages, ' . json_encode($options) . ');';
 	}
 }
diff --git a/yii/validators/RegularExpressionValidator.php b/yii/validators/RegularExpressionValidator.php
index 505812f..417f2bc 100644
--- a/yii/validators/RegularExpressionValidator.php
+++ b/yii/validators/RegularExpressionValidator.php
@@ -79,10 +79,12 @@ class RegularExpressionValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 * @throws InvalidConfigException if the "pattern" is not a valid regular expression
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$pattern = $this->pattern;
 		$pattern = preg_replace('/\\\\x\{?([0-9a-fA-F]+)\}?/', '\u$1', $pattern);
@@ -110,6 +112,7 @@ class RegularExpressionValidator extends Validator
 			$options['skipOnEmpty'] = 1;
 		}
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.regularExpression(value, messages, ' . Json::encode($options) . ');';
 	}
 }
diff --git a/yii/validators/RequiredValidator.php b/yii/validators/RequiredValidator.php
index 424f94c..aedbe05 100644
--- a/yii/validators/RequiredValidator.php
+++ b/yii/validators/RequiredValidator.php
@@ -102,9 +102,11 @@ class RequiredValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$options = array();
 		if ($this->requiredValue !== null) {
@@ -124,6 +126,7 @@ class RequiredValidator extends Validator
 			'{value}' => $object->$attribute,
 		)));
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.required(value, messages, ' . json_encode($options) . ');';
 	}
 }
diff --git a/yii/validators/StringValidator.php b/yii/validators/StringValidator.php
index 110619e..abe4634 100644
--- a/yii/validators/StringValidator.php
+++ b/yii/validators/StringValidator.php
@@ -126,9 +126,11 @@ class StringValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		$label = $object->getAttributeLabel($attribute);
 		$value = $object->$attribute;
@@ -168,6 +170,7 @@ class StringValidator extends Validator
 			$options['skipOnEmpty'] = 1;
 		}
 
+		$view->registerAssetBundle('yii/validation');
 		return 'yii.validation.string(value, messages, ' . json_encode($options) . ');';
 	}
 }
diff --git a/yii/validators/UrlValidator.php b/yii/validators/UrlValidator.php
index 6917d01..bbd8883 100644
--- a/yii/validators/UrlValidator.php
+++ b/yii/validators/UrlValidator.php
@@ -37,6 +37,12 @@ class UrlValidator extends Validator
 	 * contain the scheme part.
 	 **/
 	public $defaultScheme;
+	/**
+	 * @var boolean whether validation process should take into account IDN (internationalized
+	 * domain names). Defaults to false meaning that validation of URLs containing IDN will always
+	 * fail.
+	 */
+	public $enableIDN = false;
 
 
 	/**
@@ -87,6 +93,12 @@ class UrlValidator extends Validator
 				$pattern = $this->pattern;
 			}
 
+			if ($this->enableIDN) {
+				$value = preg_replace_callback('/:\/\/([^\/]+)/', function($matches) {
+					return '://' . idn_to_ascii($matches[1]);
+				}, $value);
+			}
+
 			if (preg_match($pattern, $value)) {
 				return true;
 			}
@@ -98,10 +110,12 @@ class UrlValidator extends Validator
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script.
 	 * @see \yii\Web\ActiveForm::enableClientValidation
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		if (strpos($this->pattern, '{schemes}') !== false) {
 			$pattern = str_replace('{schemes}', '(' . implode('|', $this->validSchemes) . ')', $this->pattern);
@@ -115,6 +129,7 @@ class UrlValidator extends Validator
 				'{attribute}' => $object->getAttributeLabel($attribute),
 				'{value}' => $object->$attribute,
 			))),
+			'enableIDN' => (boolean)$this->enableIDN,
 		);
 		if ($this->skipOnEmpty) {
 			$options['skipOnEmpty'] = 1;
@@ -123,7 +138,10 @@ class UrlValidator extends Validator
 			$options['defaultScheme'] = $this->defaultScheme;
 		}
 
+		$view->registerAssetBundle('yii/validation');
+		if ($this->enableIDN) {
+			$view->registerAssetBundle('punycode');
+		}
 		return 'yii.validation.url(value, messages, ' . Json::encode($options) . ');';
 	}
 }
-
diff --git a/yii/validators/Validator.php b/yii/validators/Validator.php
index 677191b..6b103bf 100644
--- a/yii/validators/Validator.php
+++ b/yii/validators/Validator.php
@@ -211,11 +211,13 @@ abstract class Validator extends Component
 	 *
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
+	 * @param \yii\base\View $view the view object that is going to be used to render views or view files
+	 * containing a model form with this validator applied.
 	 * @return string the client-side validation script. Null if the validator does not support
 	 * client-side validation.
 	 * @see \yii\web\ActiveForm::enableClientValidation
 	 */
-	public function clientValidateAttribute($object, $attribute)
+	public function clientValidateAttribute($object, $attribute, $view)
 	{
 		return null;
 	}
diff --git a/yii/web/Response.php b/yii/web/Response.php
index 54b7f6e..954c999 100644
--- a/yii/web/Response.php
+++ b/yii/web/Response.php
@@ -8,8 +8,10 @@
 namespace yii\web;
 
 use Yii;
+use yii\base\HttpException;
 use yii\helpers\FileHelper;
 use yii\helpers\Html;
+use yii\helpers\StringHelper;
 
 /**
  * @author Qiang Xue <qiang.xue@gmail.com>
@@ -31,27 +33,76 @@ class Response extends \yii\base\Response
 	 * @param string $content content to be set.
 	 * @param string $mimeType mime type of the content. If null, it will be guessed automatically based on the given file name.
 	 * @param boolean $terminate whether to terminate the current application after calling this method
-	 * @todo
+	 * @throws \yii\base\HttpException when range request is not satisfiable.
 	 */
 	public function sendFile($fileName, $content, $mimeType = null, $terminate = true)
 	{
-		if ($mimeType === null && ($mimeType = FileHelper::getMimeType($fileName)) === null) {
+		if ($mimeType === null && (($mimeType = FileHelper::getMimeTypeByExtension($fileName)) === null)) {
 			$mimeType = 'application/octet-stream';
 		}
+
+		$fileSize = StringHelper::strlen($content);
+		$contentStart = 0;
+		$contentEnd = $fileSize - 1;
+
+		// tell the client that we accept range requests
+		header('Accept-Ranges: bytes');
+
+		if (isset($_SERVER['HTTP_RANGE'])) {
+			// client sent us a multibyte range, can not hold this one for now
+			if (strpos(',', $_SERVER['HTTP_RANGE']) !== false) {
+				header("Content-Range: bytes $contentStart-$contentEnd/$fileSize");
+				throw new HttpException(416, 'Requested Range Not Satisfiable');
+			}
+
+			$range = str_replace('bytes=', '', $_SERVER['HTTP_RANGE']);
+
+			// range requests starts from "-", so it means that data must be dumped the end point.
+			if ($range[0] === '-') {
+				$contentStart = $fileSize - substr($range, 1);
+			} else {
+				$range = explode('-', $range);
+				$contentStart = $range[0];
+				$contentEnd = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $fileSize - 1;
+			}
+
+			/* Check the range and make sure it's treated according to the specs.
+			 * http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
+			 */
+			// End bytes can not be larger than $end.
+			$contentEnd = ($contentEnd > $fileSize) ? $fileSize : $contentEnd;
+
+			// Validate the requested range and return an error if it's not correct.
+			$wrongContentStart = ($contentStart > $contentEnd || $contentStart > $fileSize - 1 || $contentStart < 0);
+
+			if ($wrongContentStart) {   
+				header("Content-Range: bytes $contentStart-$contentEnd/$fileSize");
+				throw new HttpException(416, 'Requested Range Not Satisfiable');
+			}
+
+			header('HTTP/1.1 206 Partial Content');
+			header("Content-Range: bytes $contentStart-$contentEnd/$fileSize");
+		} else {
+			header('HTTP/1.1 200 OK');
+		}
+
+		$length = $contentEnd - $contentStart + 1; // Calculate new content length
+
 		header('Pragma: public');
 		header('Expires: 0');
 		header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
-		header("Content-type: $mimeType");
-		if (ob_get_length() === false) {
-			header('Content-Length: ' . (function_exists('mb_strlen') ? mb_strlen($content, '8bit') : strlen($content)));
-		}
-		header("Content-Disposition: attachment; filename=\"$fileName\"");
+		header('Content-Type: ' . $mimeType);
+		header('Content-Length: ' . $length);
+		header('Content-Disposition: attachment; filename="' . $fileName . '"');
 		header('Content-Transfer-Encoding: binary');
+		$content = StringHelper::substr($content, $contentStart, $length);
 
 		if ($terminate) {
 			// clean up the application first because the file downloading could take long time
 			// which may cause timeout of some resources (such as DB connection)
-			Yii::app()->end(0, false);
+			ob_start();
+			Yii::$app->end(0, false);
+			ob_end_clean();
 			echo $content;
 			exit(0);
 		} else {
diff --git a/yii/widgets/ActiveField.php b/yii/widgets/ActiveField.php
index 55357a3..45faf9d 100644
--- a/yii/widgets/ActiveField.php
+++ b/yii/widgets/ActiveField.php
@@ -138,7 +138,7 @@ class ActiveField extends Component
 			$validators = array();
 			foreach ($this->model->getActiveValidators($attribute) as $validator) {
 				/** @var \yii\validators\Validator $validator */
-				$js = $validator->clientValidateAttribute($this->model, $attribute);
+				$js = $validator->clientValidateAttribute($this->model, $attribute, $this->form->getView());
 				if ($validator->enableClientValidation && $js != '') {
 					$validators[] = $js;
 				}