diff --git a/backend/src/online_classroom/session.rs b/backend/src/online_classroom/session.rs
index 38db869..b778b23 100644
--- a/backend/src/online_classroom/session.rs
+++ b/backend/src/online_classroom/session.rs
@@ -261,6 +261,8 @@ async fn login() -> Result<(), String> {
                 log::info!("classroom login: 302 response.");
                 log_html(&html);
 
+                log::info!("classroom login cookies: {:?}", jar);
+
                 // check Set-Cookie header
                 SESSION_COOKIE.write().unwrap().jar = jar.clone();
                 Ok(())