drop states in block

src/main.rs

@@ -86,6 +86,7 @@ impl Downloader {
             .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
 
         // notify all waiters
+        {
             let mut states = self.states.lock().await;
             let state = states.remove(target_url).unwrap();
             state.result.lock().await.replace(Ok(DownloadData {
@@ -93,7 +94,7 @@ impl Downloader {
                 headers: headers.clone(),
             }));
             state.notify.notify_waiters();
-        drop(states);
+        }
 
         Ok(DownloadData { body, headers })
     }