feat: release v0.27 unified HTTP limits and safe request shutdown

transport/http2/lifecycle_test.go

@@ -247,3 +247,29 @@ func TestCanceledServeContextWaitsForShutdownDeadline(t *testing.T) {
 	}
 	waitSignal(t, canceled)
 }
+
+func TestShutdownWaitsForHandlerAfterClientDisconnect(t *testing.T) {
+	started, canceled, release, finished := make(chan struct{}), make(chan struct{}), make(chan struct{}), make(chan struct{})
+	s := New(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
+		defer close(finished)
+		close(started)
+		<-r.Context().Done()
+		close(canceled)
+		<-release
+	}))
+	defer func() { close(release); waitSignal(t, finished) }()
+	address, done := launchServer(t, s, context.Background())
+	p := newFramePeer(t, address)
+	p.get(t, 1, "/hold")
+	waitSignal(t, started)
+	p.Close()
+	waitSignal(t, canceled)
+	ctx, cancel := context.WithTimeout(context.Background(), 40*time.Millisecond)
+	defer cancel()
+	if err := s.Shutdown(ctx); !errors.Is(err, context.DeadlineExceeded) {
+		t.Fatalf("disconnected handler reported as drained: %v", err)
+	}
+	// Serve can finish its bounded shutdown, but successful Shutdown must never
+	// imply that a disconnected, still-running handler has completed.
+	_ = serveResult(t, done)
+}