adding a test

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/ProfileServlet.java

@@ -100,9 +100,9 @@ public class ProfileServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;
   private static final Logger LOG = LoggerFactory.getLogger(ProfileServlet.class);
 
-  private static final String ACCESS_CONTROL_ALLOW_METHODS = "Access-Control-Allow-Methods";
+  static final String ACCESS_CONTROL_ALLOW_METHODS = "Access-Control-Allow-Methods";
+  static final String ACCESS_CONTROL_ALLOW_ORIGIN = "Access-Control-Allow-Origin";
   private static final String ALLOWED_METHODS = "GET";
-  private static final String ACCESS_CONTROL_ALLOW_ORIGIN = "Access-Control-Allow-Origin";
   private static final String CONTENT_TYPE_TEXT = "text/plain; charset=utf-8";
   private static final String ASYNC_PROFILER_HOME_ENV = "ASYNC_PROFILER_HOME";
   private static final String ASYNC_PROFILER_HOME_SYSTEM_PROPERTY = "async.profiler.home";

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestDisabledProfileServlet.java

@@ -0,0 +1,86 @@
+/*
+ * 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.hadoop.http;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import javax.servlet.http.HttpServletResponse;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+/**
+ * Small test to cover default disabled prof endpoint.
+ */
+public class TestDisabledProfileServlet extends HttpServerFunctionalTest {
+
+  private static HttpServer2 server;
+  private static URL baseUrl;
+
+  @BeforeClass
+  public static void setup() throws Exception {
+    server = createTestServer();
+    server.start();
+    baseUrl = getServerURL(server);
+  }
+
+  @AfterClass
+  public static void cleanup() throws Exception {
+    server.stop();
+  }
+
+  @Test
+  public void testQuery() throws Exception {
+    try {
+      readOutput(new URL(baseUrl, "/prof"));
+      throw new IllegalStateException("Should not reach here");
+    } catch (IOException e) {
+      assertTrue(e.getMessage()
+          .contains(HttpServletResponse.SC_INTERNAL_SERVER_ERROR + " for URL: " + baseUrl));
+    }
+
+    // CORS headers
+    HttpURLConnection conn =
+        (HttpURLConnection) new URL(baseUrl, "/prof").openConnection();
+    assertEquals("GET", conn.getHeaderField(ProfileServlet.ACCESS_CONTROL_ALLOW_METHODS));
+    assertNotNull(conn.getHeaderField(ProfileServlet.ACCESS_CONTROL_ALLOW_ORIGIN));
+  }
+
+  @Test
+  public void testRequestMethods() throws IOException {
+    assertEquals("Unexpected response code", HttpServletResponse.SC_METHOD_NOT_ALLOWED,
+        getConnection("PUT").getResponseCode());
+    assertEquals("Unexpected response code", HttpServletResponse.SC_METHOD_NOT_ALLOWED,
+        getConnection("POST").getResponseCode());
+    assertEquals("Unexpected response code", HttpServletResponse.SC_METHOD_NOT_ALLOWED,
+        getConnection("DELETE").getResponseCode());
+    assertEquals("Unexpected response code", HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
+        getConnection("GET").getResponseCode());
+  }
+
+  private HttpURLConnection getConnection(final String method) throws IOException {
+    URL url = new URL(baseUrl, "/prof");
+    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+    conn.setRequestMethod(method);
+    return conn;
+  }
+
+}