diff --git a/cos_c_sdk/cos_object.c b/cos_c_sdk/cos_object.c
index 176a359..1a22488 100644
--- a/cos_c_sdk/cos_object.c
+++ b/cos_c_sdk/cos_object.c
@@ -986,6 +986,10 @@ int cos_gen_presigned_url(const cos_request_options_t *options,
                           http_method_e method,
                           cos_string_t *presigned_url)
 {
+    if (object == NULL || object->len == 0){
+        cos_str_set(presigned_url, "ObjectName does not support empty, please check!");
+        return COSE_UNKNOWN_ERROR;
+    }
     cos_string_t signstr;
     int res;
     cos_http_request_t *req = NULL;
@@ -1059,6 +1063,10 @@ int cos_gen_presigned_url_safe(const cos_request_options_t *options,
                           int sign_host,
                           cos_string_t *presigned_url)
 {
+    if (object == NULL || object->len == 0){
+        cos_str_set(presigned_url, "ObjectName does not support empty, please check!");
+        return COSE_UNKNOWN_ERROR;
+    }
     cos_string_t signstr;
     int res;
     cos_http_request_t *req = NULL;
diff --git a/cos_c_sdk/cos_sys_define.h b/cos_c_sdk/cos_sys_define.h
index ffa6182..a7901bf 100644
--- a/cos_c_sdk/cos_sys_define.h
+++ b/cos_c_sdk/cos_sys_define.h
@@ -132,7 +132,7 @@ typedef apr_array_header_t cos_array_header_t;
 #define CR     (char) 13
 #define CRLF   "\x0d\x0a"
 
-#define COS_VERSION    "5.0.16"
+#define COS_VERSION    "5.0.17"
 #define COS_VER        "cos-sdk-c/" COS_VERSION
 
 #define COS_HTTP_PREFIX   "http://"
diff --git a/cos_c_sdk/cos_sys_util.c b/cos_c_sdk/cos_sys_util.c
index 70505b1..f1a7213 100644
--- a/cos_c_sdk/cos_sys_util.c
+++ b/cos_c_sdk/cos_sys_util.c
@@ -12,7 +12,7 @@ static const char *g_s_mon[] = {
 };
 
 static const char g_s_gmt_format[] = "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT";
-static int retry_change_domin_config = 1;
+static int retry_change_domin_config = COS_FALSE;
 
 static cos_table_t *g_sign_header_table = NULL;
 static cos_pool_t *g_table_pool = NULL;