[WICKET-7067] WebSocketResponse does not allow setting a header thus,…

… disableCaching fails with an UnsupportedOperationException
apache · Aug 18, 2023 · 4999c67 · 4999c67
1 parent 2a84915
commit 4999c67
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/wicket-core/src/main/java/org/apache/wicket/DefaultExceptionMapper.java b/wicket-core/src/main/java/org/apache/wicket/DefaultExceptionMapper.java
@@ -54,10 +54,11 @@ public IRequestHandler map(Exception e)
 		try
 		{
 			Response response = RequestCycle.get().getResponse();
-			if (response instanceof WebResponse)
+			// WICKET-7067 WebSocketResponse doesn't allow setting headers
+			if (response instanceof WebResponse && ((WebResponse) response).isHeaderSupported())
 			{
 				// we don't want to cache an exceptional reply in the browser
-				((WebResponse)response).disableCaching();
+				((WebResponse) response).disableCaching();
 			}
 			return internalMap(e);
 		}