diff --git a/wchat/common/HttpClient.php b/wchat/common/HttpClient.php
index a32b210..a7a25a0 100644
--- a/wchat/common/HttpClient.php
+++ b/wchat/common/HttpClient.php
@@ -681,22 +681,13 @@ class HttpClient
 			curl_setopt($ch, CURLOPT_POST, 1);
 		}
 
-		if ($this->method != self::GET && !empty($this->_data)) {
-			$this->_data = $this->mergeParams($data);
-		} else {
-			$this->_data = $this->mergeParams($data);
-		}
 		curl_setopt($ch, CURLOPT_CUSTOMREQUEST, strtoupper($this->method));
-
-		if (!is_string($this->_data)) {
-			$message = $this->header['Content-Type'] ?? $this->header['content-type'] ?? 'application/json';
-			if ($message == 'application/json') {
-				$this->_data = json_encode($this->_data, JSON_UNESCAPED_UNICODE);
-			} else {
-				$this->_data = http_build_query($this->_data);
-			}
+		if ($this->method === self::GET && !empty($this->_data)) {
+			curl_setopt($ch, CURLOPT_POSTFIELDS, $this->toRequest($data));
+		}
+		if ($this->method === self::POST) {
+			curl_setopt($ch, CURLOPT_POSTFIELDS, $this->mergeParams($data));
 		}
-		curl_setopt($ch, CURLOPT_POSTFIELDS, $this->_data);
 
 		$output = curl_exec($ch);
 		if ($output === false) {