diff --git a/src/Monolog/Handler/ChromePHPHandler.php b/src/Monolog/Handler/ChromePHPHandler.php
index 00244c65..31c35cf1 100644
--- a/src/Monolog/Handler/ChromePHPHandler.php
+++ b/src/Monolog/Handler/ChromePHPHandler.php
@@ -33,6 +33,11 @@ class ChromePHPHandler extends AbstractProcessingHandler
      * Header name
      */
     const HEADER_NAME = 'X-ChromeLogger-Data';
+    
+    /**
+     * Regular expression to detect supported browsers (matches any Chrome, or Firefox 43+)
+     */
+    const USER_AGENT_REGEX = '{\b(?:Chrome/\d+(?:\.\d+)*|Firefox/(?:4[3-9]|[5-9]\d|\d{3,})(?:\.\d)*)\b}';
 
     protected static $initialized = false;
 
@@ -178,8 +183,7 @@ class ChromePHPHandler extends AbstractProcessingHandler
             return false;
         }
 
-        // matches any Chrome, or Firefox 43+
-        return preg_match('{\b(?:Chrome/\d+(?:\.\d+)*|Firefox/(?:4[3-9]|[5-9]\d|\d{3,})(?:\.\d)*)\b}', $_SERVER['HTTP_USER_AGENT']);
+        return preg_match(self::USER_AGENT_REGEX, $_SERVER['HTTP_USER_AGENT']);
     }
 
     /**
diff --git a/src/Monolog/Handler/HipChatHandler.php b/src/Monolog/Handler/HipChatHandler.php
index 9807df1c..73049f36 100644
--- a/src/Monolog/Handler/HipChatHandler.php
+++ b/src/Monolog/Handler/HipChatHandler.php
@@ -143,6 +143,14 @@ class HipChatHandler extends SocketHandler
             'color' => $this->getAlertColor($record['level']),
         );
 
+        if (!$this->validateStringLength($dataArray['message'], static::MAXIMUM_MESSAGE_LENGTH)) {
+            if (function_exists('mb_substr')) {
+                $dataArray['message'] = mb_substr($dataArray['message'], 0, static::MAXIMUM_MESSAGE_LENGTH).' [truncated]';
+            } else {
+                $dataArray['message'] = substr($dataArray['message'], 0, static::MAXIMUM_MESSAGE_LENGTH).' [truncated]';
+            }
+        }
+
         // if we are using the legacy API then we need to send some additional information
         if ($this->version == self::API_V1) {
             $dataArray['room_id'] = $this->room;
diff --git a/tests/Monolog/Formatter/GelfMessageFormatterTest.php b/tests/Monolog/Formatter/GelfMessageFormatterTest.php
index 2052cf66..e6bd3098 100644
--- a/tests/Monolog/Formatter/GelfMessageFormatterTest.php
+++ b/tests/Monolog/Formatter/GelfMessageFormatterTest.php
@@ -211,8 +211,20 @@ class GelfMessageFormatterTest extends \PHPUnit_Framework_TestCase
         );
         $message = $formatter->format($record);
         $messageArray = $message->toArray();
-        $this->assertLessThanOrEqual(32766, strlen($messageArray['_key']));
-        $this->assertLessThanOrEqual(32766, strlen($messageArray['_ctxt_exception']));
+
+        // 200 for padding + metadata
+        $length = 200;
+
+        foreach ($messageArray as $key => $value) {
+            if (!in_array($key, array('level', 'timestamp'))) {
+                $length += strlen($value);
+            }
+        }
+
+        // in graylog2/gelf-php before 1.4.1 empty strings are filtered and won't be included in the message
+        // though it should be sufficient to ensure that the entire message length does not exceed the maximum
+        // length being allowed
+        $this->assertLessThanOrEqual(32766, $length, 'The message length is no longer than the maximum allowed length');
     }
 
     private function isLegacy()
diff --git a/tests/Monolog/Handler/HipChatHandlerTest.php b/tests/Monolog/Handler/HipChatHandlerTest.php
index e45f57de..52dc9dac 100644
--- a/tests/Monolog/Handler/HipChatHandlerTest.php
+++ b/tests/Monolog/Handler/HipChatHandlerTest.php
@@ -150,6 +150,16 @@ class HipChatHandlerTest extends TestCase
         $this->assertRegexp('/message=Backup\+of\+database\+%22example%22\+finished\+in\+16\+minutes\./', $content);
     }
 
+    public function testWriteTruncatesLongMessage()
+    {
+        $this->createHandler();
+        $this->handler->handle($this->getRecord(Logger::CRITICAL, str_repeat('abcde', 2000)));
+        fseek($this->res, 0);
+        $content = fread($this->res, 12000);
+
+        $this->assertRegexp('/message='.str_repeat('abcde', 1900).'\+%5Btruncated%5D/', $content);
+    }
+
     /**
      * @dataProvider provideLevelColors
      */