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in repository https://gitbox.apache.org/repos/asf/zeppelin.git


The following commit(s) were added to refs/heads/branch-0.12 by this push:
     new 2f4aa4f50a [ZEPPELIN-6213] Add Cache-Control Header to API Calls
2f4aa4f50a is described below

commit 2f4aa4f50a82129c2281dba0c00818e175af6961
Author: Philipp Dallig <philipp.dal...@gmail.com>
AuthorDate: Mon Jul 14 09:32:26 2025 +0200

    [ZEPPELIN-6213] Add Cache-Control Header to API Calls
    
    ### What is this PR for?
    This pull request sets the no cache header for all Zeppelin API calls.
    
    ### What type of PR is it?
    * Improvement
    
    ### What is the Jira issue?
    * https://issues.apache.org/jira/browse/ZEPPELIN-6213
    
    ### How should this be tested?
    * CI
    
    ### Screenshots
    Before - no cache header
    
![grafik](https://github.com/user-attachments/assets/e4bff5fb-686c-4944-9da1-21130214ac9d)
    
    After - with cache header
    
![grafik](https://github.com/user-attachments/assets/114cc66e-70fd-49fb-9bb1-f2b4026d4a86)
    
    ### Questions:
    * Does the license files need to update? No
    * Is there breaking changes for older versions? No
    * Does this needs documentation? No
    
    Closes #4956 from Reamer/cache_header.
    
    Signed-off-by: Philipp Dallig <philipp.dal...@gmail.com>
    (cherry picked from commit 1fe6b041fe9b8321afe9c1016b5729dfe1d2773f)
    Signed-off-by: Philipp Dallig <philipp.dal...@gmail.com>
---
 .../zeppelin/rest/filter/CacheControlFilter.java   | 36 ++++++++++++
 .../apache/zeppelin/server/RestApiApplication.java |  3 +
 .../rest/filter/CacheContolFilterTest.java         | 65 ++++++++++++++++++++++
 3 files changed, 104 insertions(+)

diff --git 
a/zeppelin-server/src/main/java/org/apache/zeppelin/rest/filter/CacheControlFilter.java
 
b/zeppelin-server/src/main/java/org/apache/zeppelin/rest/filter/CacheControlFilter.java
new file mode 100644
index 0000000000..4f7585e12e
--- /dev/null
+++ 
b/zeppelin-server/src/main/java/org/apache/zeppelin/rest/filter/CacheControlFilter.java
@@ -0,0 +1,36 @@
+/*
+ * 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.zeppelin.rest.filter;
+
+import jakarta.ws.rs.HttpMethod;
+import jakarta.ws.rs.container.ContainerRequestContext;
+import jakarta.ws.rs.container.ContainerResponseContext;
+import jakarta.ws.rs.container.ContainerResponseFilter;
+import jakarta.ws.rs.core.CacheControl;
+import jakarta.ws.rs.core.HttpHeaders;
+
+public class CacheControlFilter implements ContainerResponseFilter {
+
+  @Override
+  public void filter(ContainerRequestContext req, ContainerResponseContext 
res) {
+      if (req.getMethod().equals(HttpMethod.GET)) {
+        CacheControl cc = new CacheControl();
+        cc.setNoCache(true);
+        res.getHeaders().add(HttpHeaders.CACHE_CONTROL, cc);
+      }
+  }
+}
diff --git 
a/zeppelin-server/src/main/java/org/apache/zeppelin/server/RestApiApplication.java
 
b/zeppelin-server/src/main/java/org/apache/zeppelin/server/RestApiApplication.java
index 711d56512b..f4cff80206 100644
--- 
a/zeppelin-server/src/main/java/org/apache/zeppelin/server/RestApiApplication.java
+++ 
b/zeppelin-server/src/main/java/org/apache/zeppelin/server/RestApiApplication.java
@@ -35,6 +35,7 @@ import org.apache.zeppelin.rest.SecurityRestApi;
 import org.apache.zeppelin.rest.SessionRestApi;
 import org.apache.zeppelin.rest.ZeppelinRestApi;
 import org.apache.zeppelin.rest.exception.WebApplicationExceptionMapper;
+import org.apache.zeppelin.rest.filter.CacheControlFilter;
 import org.glassfish.jersey.server.ServerProperties;
 
 public class RestApiApplication extends Application {
@@ -57,6 +58,8 @@ public class RestApiApplication extends Application {
     s.add(WebApplicationExceptionMapper.class);
     // add JSON-Consumer and Producer
     s.add(GsonProvider.class);
+    // Filter
+    s.add(CacheControlFilter.class);
     return s;
   }
 
diff --git 
a/zeppelin-server/src/test/java/org/apache/zeppelin/rest/filter/CacheContolFilterTest.java
 
b/zeppelin-server/src/test/java/org/apache/zeppelin/rest/filter/CacheContolFilterTest.java
new file mode 100644
index 0000000000..90401e966b
--- /dev/null
+++ 
b/zeppelin-server/src/test/java/org/apache/zeppelin/rest/filter/CacheContolFilterTest.java
@@ -0,0 +1,65 @@
+/*
+ * 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.zeppelin.rest.filter;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+
+import org.apache.http.Header;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.zeppelin.MiniZeppelinServer;
+import org.apache.zeppelin.rest.AbstractTestRestApi;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.ws.rs.core.HttpHeaders;
+
+class CacheContolFilterTest extends AbstractTestRestApi {
+
+  private static MiniZeppelinServer zepServer;
+
+  @BeforeAll
+  static void init() throws Exception {
+    zepServer = new 
MiniZeppelinServer(CacheContolFilterTest.class.getSimpleName());
+    zepServer.start();
+  }
+
+  @AfterAll
+  static void destroy() throws Exception {
+    zepServer.destroy();
+  }
+
+  @BeforeEach
+  void setUp() {
+    zConf = zepServer.getZeppelinConfiguration();
+  }
+
+  @Test
+  void testCacheControl() throws IOException {
+    try (CloseableHttpResponse get = httpGet("/version")) {
+      Header[] headers = get.getHeaders(HttpHeaders.CACHE_CONTROL);
+      assertEquals(1, headers.length);
+      Header cacheHeader = headers[0];
+      assertEquals(HttpHeaders.CACHE_CONTROL, cacheHeader.getName());
+      assertTrue(cacheHeader.getValue().contains("no-cache"), () -> "Actual 
content:" + cacheHeader.getValue());
+    }
+  }
+}

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