diff --git a/src/Symfony/Component/Debug/ExceptionHandler.php b/src/Symfony/Component/Debug/ExceptionHandler.php
index cd781b5609..458d647f0b 100644
--- a/src/Symfony/Component/Debug/ExceptionHandler.php
+++ b/src/Symfony/Component/Debug/ExceptionHandler.php
@@ -91,9 +91,11 @@ class ExceptionHandler
             $exception = FlattenException::create($exception);
         }
 
-        header(sprintf('HTTP/1.0 %s', $exception->getStatusCode()));
-        foreach ($exception->getHeaders() as $name => $value) {
-            header($name.': '.$value, false);
+        if (!headers_sent()) {
+            header(sprintf('HTTP/1.0 %s', $exception->getStatusCode()));
+            foreach ($exception->getHeaders() as $name => $value) {
+                header($name.': '.$value, false);
+            }
         }
 
         echo $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
diff --git a/src/Symfony/Component/Validator/ConstraintViolation.php b/src/Symfony/Component/Validator/ConstraintViolation.php
index ca8d525f67..36a42aaec4 100644
--- a/src/Symfony/Component/Validator/ConstraintViolation.php
+++ b/src/Symfony/Component/Validator/ConstraintViolation.php
@@ -95,7 +95,14 @@ class ConstraintViolation implements ConstraintViolationInterface
      */
     public function __toString()
     {
-        $class = (string) (is_object($this->root) ? get_class($this->root) : $this->root);
+        if (is_object($this->root)) {
+            $class = get_class($this->root);
+        } elseif (is_array($this->root)) {
+            $class = "Array";
+        } else {
+            $class = (string) $this->root;
+        }
+
         $propertyPath = (string) $this->propertyPath;
         $code = $this->code;
 
diff --git a/src/Symfony/Component/Validator/Constraints/UrlValidator.php b/src/Symfony/Component/Validator/Constraints/UrlValidator.php
index 1fc380ea9e..9b0f9de651 100644
--- a/src/Symfony/Component/Validator/Constraints/UrlValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/UrlValidator.php
@@ -25,7 +25,7 @@ class UrlValidator extends ConstraintValidator
     const PATTERN = '~^
             (%s)://                                 # protocol
             (
-                ([\pL\pN\pS-]+\.)+[\pL]+                   # a domain name
+                ([\pL\pN\pS-]+\.)+([\pL]|xn\-\-[\pL\pN-]+)+                   # a domain name
                     |                                     #  or
                 \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}      # a IP address
                     |                                     #  or
diff --git a/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php b/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php
index e1f06c2428..2ceb0169a1 100644
--- a/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php
+++ b/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php
@@ -33,4 +33,23 @@ EOF;
 
         $this->assertSame($expected, (string) $violation);
     }
+
+    public function testToStringHandlesArrayRoots()
+    {
+        $violation = new ConstraintViolation(
+            '42 cannot be used here',
+            'this is the message template',
+            array(),
+            array('some_value' =>  42),
+            'some_value',
+            null
+        );
+
+        $expected = <<<EOF
+Array.some_value:
+    42 cannot be used here
+EOF;
+
+        $this->assertSame($expected, (string) $violation);
+    }
 }
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
index b335ae30a8..e74bc18c40 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
@@ -91,15 +91,28 @@ class UrlValidatorTest extends \PHPUnit_Framework_TestCase
             array('http://[::1]:80/'),
             array('http://[1:2:3::4:5:6:7]/'),
             array('http://sãopaulo.com/'),
+            array('http://xn--sopaulo-xwa.com/'),
             array('http://sãopaulo.com.br/'),
+            array('http://xn--sopaulo-xwa.com.br/'),
             array('http://пример.испытание/'),
+            array('http://xn--e1afmkfd.xn--80akhbyknj4f/'),
             array('http://مثال.إختبار/'),
+            array('http://xn--mgbh0fb.xn--kgbechtv/'),
             array('http://例子.测试/'),
+            array('http://xn--fsqu00a.xn--0zwm56d/'),
             array('http://例子.測試/'),
+            array('http://xn--fsqu00a.xn--g6w251d/'),
             array('http://例え.テスト/'),
+            array('http://xn--r8jz45g.xn--zckzah/'),
             array('http://مثال.آزمایشی/'),
+            array('http://xn--mgbh0fb.xn--hgbk6aj7f53bba/'),
             array('http://실례.테스트/'),
+            array('http://xn--9n2bp8q.xn--9t4b11yi5a/'),
             array('http://العربية.idn.icann.org/'),
+            array('http://xn--ogb.idn.icann.org/'),
+            array('http://xn--e1afmkfd.xn--80akhbyknj4f.xn--e1afmkfd/'),
+            array('http://xn--espaa-rta.xn--ca-ol-fsay5a/'),
+            array('http://xn--d1abbgf6aiiy.xn--p1ai/'),
             array('http://☎.com/'),
         );
     }