diff --git a/internal/dnsclients/provider_custom_http.go b/internal/dnsclients/provider_custom_http.go
index ed9d6a90..6c726c21 100644
--- a/internal/dnsclients/provider_custom_http.go
+++ b/internal/dnsclients/provider_custom_http.go
@@ -164,10 +164,11 @@ func (this *CustomHTTPProvider) post(params maps.Map) (respData []byte, err erro
 	if err != nil {
 		return nil, err
 	}
-	timestamp := strconv.FormatInt(time.Now().Unix(), 10)
+	var timestamp = strconv.FormatInt(time.Now().Unix(), 10)
 	req.Header.Set("Timestamp", timestamp)
 	req.Header.Set("Token", fmt.Sprintf("%x", sha1.Sum([]byte(this.secret+"@"+timestamp))))
 	req.Header.Set("User-Agent", teaconst.ProductName+"/"+teaconst.Version)
+	req.Header.Set("Content-Type", "application/json")
 
 	resp, err := customHTTPClient.Do(req)
 	if err != nil {