mateczagany commented on code in PR #27407:
URL: https://github.com/apache/flink/pull/27407#discussion_r2694777002


##########
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/AbstractRestHandler.java:
##########
@@ -85,14 +85,15 @@ protected CompletableFuture<Void> respondToRequest(
             response = FutureUtils.completedExceptionally(e);
         }
 
-        return response.thenAccept(
+        return response.thenAcceptAsync(
                 resp ->
                         HandlerUtils.sendResponse(
                                 ctx,
                                 httpRequest,
                                 resp,
                                 messageHeaders.getResponseStatusCode(),
-                                responseHeaders));
+                                responseHeaders),
+                ctx.executor());

Review Comment:
   Oh, nevermind, this is the same issue as before, I was on wrong branch 
locally. Unfortunately keeping the Netty version as-is did not help get rid of 
this.
   
   If you try to run this test suite locally, you will see these errors: 
`Received fatal alert: certificate_unknown`. This is because starting from 
Netty 4.2, SSL hostname verification is on by default. Setting 
`security.ssl.verify-hostname` has NO effect, because this is not used 
anywhere. So I suggest to change its default value to `false`, and use it to 
set SSL hostname verification, as that would allow us to have the same behavior 
as before.



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