diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 9446f0a07a..a0a6eb140e 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -53,6 +53,7 @@ Yii Framework 2 Change Log
 - Bug #2607: `yii message` tool wasn't updating `message` table (mitalcoi)
 - Bug #2624: Html::textArea() should respect "name" option. (qiangxue)
 - Bug #2653: Fixed the bug that unsetting an unpopulated AR relation would trigger exception (qiangxue)
+- Bug #2681: Fixed the bug of php build-in server https://bugs.php.net/bug.php?id=66606 (dizews)
 - Bug: Fixed `Call to a member function registerAssetFiles() on a non-object` in case of wrong `sourcePath` for an asset bundle (samdark)
 - Bug: Fixed incorrect event name for `yii\jui\Spinner` (samdark)
 - Bug: Json::encode() did not handle objects that implement JsonSerializable interface correctly (cebe)
diff --git a/framework/web/Request.php b/framework/web/Request.php
index e8d69d62b3..4b7c2abb52 100644
--- a/framework/web/Request.php
+++ b/framework/web/Request.php
@@ -958,7 +958,7 @@ class Request extends \yii\base\Request
 	{
 		if (isset($_SERVER["CONTENT_TYPE"])) {
 			return $_SERVER["CONTENT_TYPE"];
-		} elseif (isset($_SERVER["HTTP_CONTENT_TYPE"])) {
+		} elseif (isset($_SERVER["HTTP_CONTENT_TYPE"])) { //fix bug https://bugs.php.net/bug.php?id=66606
 			return $_SERVER["HTTP_CONTENT_TYPE"];
 		}
 		return null;