Handle idle timeout

Author: JackStromberg

articles/application-gateway/for-containers/server-sent-events.md

@@ -5,7 +5,7 @@ services: application gateway
 author: greg-lindsay
 ms.service: azure-appgw-for-containers
 ms.topic: concept-article
-ms.date: 5/9/2024
+ms.date: 5/8/2025
 ms.author: greglin
 ---
 
@@ -59,6 +59,9 @@ spec:
       routeTimeout: 0s 
 ```
 
+>[!NOTE]
+>The idle timeout for Application Gateway for Containers is currently set to 5 minutes. If your application does not send or receive data within this period, consider sending a keep-alive request to prevent the connection from closing. You can implement this by prefixing a message with a colon `:` to act as a comment. For example, you may send the following message as a keep alive: `: keep-alive\n\n`
+
 # [Ingress API](#tab/session-affinity-ingress-api)
 
 Server-sent events aren't supported using Ingress API.