Staging work

Author: jkotalik

src/Servers/Kestrel/Core/src/Internal/Http3/Http3Connection.cs

@@ -237,6 +237,7 @@ internal async Task InnerProcessStreamsAsync<TContext>(IHttpApplication<TContext
             // Don't create Encoder and Decoder as they aren't used now.
             Exception? error = null;
 
+            // TODO should we await the control stream task?
             var controlTask = CreateControlStream(application);
 
             _timeoutControl.SetTimeout(Limits.KeepAliveTimeout.Ticks, TimeoutReason.KeepAlive);

src/Servers/Kestrel/Transport.Quic/src/Internal/QuicConnectionContext.cs

@@ -14,7 +14,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Experimental.Quic.Intern
 {
     internal class QuicConnectionContext : TransportMultiplexedConnection, IProtocolErrorCodeFeature
     {
-        private QuicConnection _connection;
+        private readonly QuicConnection _connection;
         private readonly QuicTransportContext _context;
         private readonly IQuicTrace _log;
         private readonly CancellationTokenSource _connectionClosedTokenSource = new CancellationTokenSource();
@@ -90,13 +90,18 @@ public override void Abort(ConnectionAbortedException abortReason)
                 context.Start();
                 return context;
             }
-            catch (QuicException ex)
+            catch (QuicConnectionAbortedException ex)
             {
-                // Accept on graceful close throws an aborted exception rather than returning null.
-
+                // Shutdown initiated by peer, abortive.
                 // TODO cancel CTS here?
                 _log.LogDebug($"Accept loop ended with exception: {ex.Message}");
             }
+            catch (QuicOperationAbortedException)
+            {
+                // Shutdown initiated by us
+
+                // Allow for graceful closure.
+            }
 
             return null;
         }