diff --git a/src/aliyun/credential.rs b/src/aliyun/credential.rs
index baf55c4..8f8c1cf 100644
--- a/src/aliyun/credential.rs
+++ b/src/aliyun/credential.rs
@@ -140,7 +140,7 @@ impl Loader {
         // Construct request to Aliyun STS Service.
 
         let url = match &self.config.sts_endpoint{
-            Some(definde_sts_endpoint) =>  format!("{}/?Action=AssumeRoleWithOIDC&OIDCProviderArn={}&RoleArn={}&RoleSessionName={}&Format=JSON&Version=2015-04-01&Timestamp={}&OIDCToken={}", definde_sts_endpoint,provider_arn, role_arn, role_session_name, format_rfc3339(now()), token),
+            Some(definde_sts_endpoint) =>  format!("https://{}/?Action=AssumeRoleWithOIDC&OIDCProviderArn={}&RoleArn={}&RoleSessionName={}&Format=JSON&Version=2015-04-01&Timestamp={}&OIDCToken={}", definde_sts_endpoint, provider_arn, role_arn, role_session_name, format_rfc3339(now()), token),
             None => format!("https://sts.aliyuncs.com/?Action=AssumeRoleWithOIDC&OIDCProviderArn={}&RoleArn={}&RoleSessionName={}&Format=JSON&Version=2015-04-01&Timestamp={}&OIDCToken={}", provider_arn, role_arn, role_session_name, format_rfc3339(now()), token),
         };
         let req = self.client.get(&url).header(