New connection control.

src/Aiursoft.ChessServer/Controllers/GamesController.cs

@@ -66,7 +66,14 @@ public class GamesController : Controller
             subscription = channel.Subscribe(async t => { await _pusher.SendMessage(t.Content); });
             while (_pusher.Connected)
             {
-                await Task.Delay(10 * 1000);
+                try
+                {
+                    await Task.Delay(int.MaxValue, HttpContext.RequestAborted);
+                }
+                catch (TaskCanceledException)
+                {
+                    break;
+                }
             }
         }
         finally
@@ -114,6 +121,7 @@ public class GamesController : Controller
             {
                 return BadRequest();
             }
+
             game.Move(move);
             var fen = game.ToFen();
             var channel = _database.GetOrAddChannel(id);

src/Aiursoft.ChessServer/Services/WebSocketPusher.cs

@@ -18,7 +18,14 @@ public class WebSocketPusher : IScopedDependency
 
     public async Task SendMessage(string message)
     {
-        await (_ws?.SendMessage(message) ?? throw new InvalidOperationException("WebSocket is not connected!"));
+        try
+        {
+            await (_ws?.SendMessage(message) ?? throw new InvalidOperationException("WebSocket is not connected!"));
+        }
+        catch (WebSocketException)
+        {
+            _dropped = true;
+        }
     }
 
     public async Task PendingClose()