Ensure iOS6 does not cache heartbeat responses (#10370)

Change-Id: Ia7eb92fd7cc0aa10827c602de69aa22200471bda

1 files changed, 3 insertions, 0 deletions

diff --git a/server/src/com/vaadin/server/AbstractCommunicationManager.java b/server/src/com/vaadin/server/AbstractCommunicationManager.java
index 0832a1a33a..19b0ac2aee 100644
--- a/server/src/com/vaadin/server/AbstractCommunicationManager.java
+++ b/server/src/com/vaadin/server/AbstractCommunicationManager.java
@@ -2733,6 +2733,9 @@ public abstract class AbstractCommunicationManager implements Serializable {
         }
         if (ui != null) {
             ui.setLastHeartbeatTimestamp(System.currentTimeMillis());
+            // Ensure that the browser does not cache heartbeat responses.
+            // iOS 6 Safari requires this (#10370)
+            response.setHeader("Cache-Control", "no-cache");
         } else {
             response.sendError(HttpServletResponse.SC_NOT_FOUND, "UI not found");
         }