Fix

main.go

@@ -79,12 +79,12 @@ func Main() error {
 	if err != nil {
 		return err
 	}
-	req.Header.Add("brandId", brandID)
-	req.Header.Add("Content-Type", "application/json")
+	req.Header.Set("brandId", brandID)
+	req.Header.Set("Content-Type", "application/json")
 	if len(headers) > 0 {
 		for _, pair := range strings.Split(headers, ",") {
 			kv := strings.Split(pair, "=")
-			req.Header.Add(kv[0], kv[1])
+			req.Header.Set(kv[0], kv[1])
 		}
 	}
 	if needJWT {