[BE][Classroom] Log html response on login http 302

backend/src/online_classroom/session.rs

@@ -252,11 +252,21 @@ async fn login() -> Result<(), String> {
     match response {
         Ok(mut r) => {
             if r.status() == isahc::http::StatusCode::FOUND {
-                // TODO: Even if this is a 302, it might not be a successful login
+                let html = match r.text() {
+                    Ok(t) => t,
+                    Err(err) => {
+                        return Err(format!("Error getting text from login response: {:?}", err))
+                    }
+                };
+                log::info!("classroom login: 302 response.");
+                log_html(&html);
+
                 // check Set-Cookie header
                 SESSION_COOKIE.write().unwrap().jar = jar.clone();
                 Ok(())
             } else {
+                log::info!("classroom login: not 302");
+
                 // Write html to file
                 match r.text() {
                     Ok(t) => {