diff --git a/wchat/common/HttpClient.php b/wchat/common/HttpClient.php
index c0b1290..eee966d 100644
--- a/wchat/common/HttpClient.php
+++ b/wchat/common/HttpClient.php
@@ -213,7 +213,7 @@ class HttpClient
 	 */
 	public function setHeader($key, $value)
 	{
-		$this->header[strtoupper($key)] = $value;
+		$this->header[$key] = $value;
 	}
 
 	/**
@@ -222,7 +222,7 @@ class HttpClient
 	 */
 	public function addHeader($key, $value)
 	{
-		$this->header[strtoupper($key)] = $value;
+		$this->header[$key] = $value;
 	}
 
 	/**
@@ -504,9 +504,6 @@ class HttpClient
 		if (!empty($this->header)) {
 			$client->setHeaders($this->header);
 		}
-
-		var_dump($this->header);
-
 		$client->setMethod(strtoupper($this->method));
 		if (strtolower($this->method) == self::GET && !empty($data)) {
 			$url .= '?' . $data;
@@ -950,7 +947,7 @@ class HttpClient
 			return [];
 		}
 		foreach ($headers as $key => $val) {
-			$this->header[strtoupper($key)] = $val;
+			$this->header[$key] = $val;
 		}
 		return $this->header;
 	}