Added example of manual connection release

httpclient5/src/test/java/org/apache/hc/client5/http/examples/ClientConnectionRelease.java

@@ -0,0 +1,64 @@
+/*
+ * ====================================================================
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.hc.client5.http.examples;
+
+import org.apache.hc.client5.http.classic.methods.HttpGet;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
+import org.apache.hc.core5.http.ClassicHttpResponse;
+import org.apache.hc.core5.http.HttpHost;
+import org.apache.hc.core5.http.io.entity.EntityUtils;
+import org.apache.hc.core5.http.message.StatusLine;
+
+/**
+ * This example demonstrates how to ensure the release of the underlying HTTP connection back to
+ * the connection manager in case of a manual processing of HTTP responses.
+ */
+public class ClientConnectionRelease {
+
+    public static void main(final String[] args) throws Exception {
+        try (final CloseableHttpClient httpclient = HttpClients.createDefault()) {
+            final HttpHost target = new HttpHost("http", "httpbin.org");
+            final HttpGet httpget = new HttpGet("/get");
+
+            System.out.println("Executing request " + httpget.getMethod() + " " + httpget.getUri());
+
+            // Make sure the response is always closed at the end of the message exchange
+            try (ClassicHttpResponse response = httpclient.executeOpen(target, httpget, null)) {
+                System.out.println("----------------------------------------");
+                System.out.println(httpget + "->" + new StatusLine(response));
+                // Make sure the response content entity has been fully consumed
+                // in order to ensure the underlying connection can be re-used for
+                // subsequent requests
+                EntityUtils.consume(response.getEntity());
+            }
+        }
+    }
+
+}
+