gaborkaszab commented on code in PR #14035:
URL: https://github.com/apache/iceberg/pull/14035#discussion_r2358712730


##########
api/src/main/java/org/apache/iceberg/exceptions/NotModifiedException.java:
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@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg.exceptions;
+
+import com.google.errorprone.annotations.FormatMethod;
+
+/** Exception to indicate that resource is unchanged. */
+public class NotModifiedException extends RESTException {

Review Comment:
   Thank you for taking a look, @pvary !
   The thing with changing response types (and parameters) is that it is an API 
breaking change. Not directly for `RESTCatalogAdapter.handleRequest()` but for 
the calling `RESTCatalogAdapter.execute()` that invokes this, because it is an 
override of `HTTPRequest.execute()`.
   So with the current design of the reference IRC, I think we can either 
follow the exception driven approach, or implement some (not that foolproof) 
checks in `RESTCatalogServlet` like "if the responseBody is null and the load 
table endpoint was called, then return 304". The exception-driven approach 
seems to be the cleanest on the reference IRC side.
   cc @amogh-jahagirdar @nastra 



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