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-rw-r--r--server/src/main/java/com/vaadin/server/VaadinServlet.java7
1 files changed, 7 insertions, 0 deletions
diff --git a/server/src/main/java/com/vaadin/server/VaadinServlet.java b/server/src/main/java/com/vaadin/server/VaadinServlet.java
index fc8aaeaac2..58320ecb0a 100644
--- a/server/src/main/java/com/vaadin/server/VaadinServlet.java
+++ b/server/src/main/java/com/vaadin/server/VaadinServlet.java
@@ -943,6 +943,13 @@ public class VaadinServlet extends HttpServlet implements Constants {
/**
* Writes the contents of the given resourceUrl in the response. Can be
* overridden to add/modify response headers and similar.
+ * <p>
+ * WARNING: note that this should not be used for a {@code resourceUrl} that
+ * represents a directory! For security reasons, the directory contents
+ * should not be ever written into the {@code response}, and the
+ * implementation which is used for setting the content length relies on
+ * {@link URLConnection#getContentLength()} method which returns incorrect
+ * values for directories.
*
* @param request
* The request for the resource