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Google API Client Library for Java. Supports Java 5 (or higher) desktop (SE) and web (EE), Android, and Google App Engine.
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/*
 * Copyright (c) 2010 Google Inc.
 *
 * Licensed 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 com.google.api.client.http.apache;

import com.google.api.client.http.HttpTransport;

import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.params.ClientPNames;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.params.ConnPerRouteBean;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;

/**
 * Thread-safe HTTP transport based on the Apache HTTP Client library.
 * 
 * Default settings:
 * 
 * 
 * The client connection manager is set to {@link ThreadSafeClientConnManager}.
 * Timeout is set to 20 seconds using {@link ConnManagerParams#setTimeout},
 * {@link HttpConnectionParams#setConnectionTimeout}, and {@link HttpConnectionParams#setSoTimeout}.
 * 
 * The socket buffer size is set to 8192 using {@link HttpConnectionParams#setSocketBufferSize}.
 * 
 * 
 * 
 * These parameters may be overridden by setting the values on the {@link #httpClient}.
 * {@link HttpClient#getParams() getParams()}. Please read the Apache HTTP
 * Client connection management tutorial for more complex configuration questions, such as how
 * to set up an HTTP proxy.
 * 
 *
 * @since 1.0
 * @author Yaniv Inbar
 */
public final class ApacheHttpTransport extends HttpTransport {

  /**
   * Apache HTTP client.
   *
   * @since 1.1
   */
  public final HttpClient httpClient;

  /**
   * @since 1.3
   */
  public ApacheHttpTransport() {
    // Turn off stale checking. Our connections break all the time anyway,
    // and it's not worth it to pay the penalty of checking every time.
    HttpParams params = new BasicHttpParams();
    HttpConnectionParams.setStaleCheckingEnabled(params, false);
    HttpConnectionParams.setSocketBufferSize(params, 8192);
    ConnManagerParams.setMaxTotalConnections(params, 200);
    ConnManagerParams.setMaxConnectionsPerRoute(params, new ConnPerRouteBean(20));
    params.setBooleanParameter(ClientPNames.HANDLE_REDIRECTS, false);
    HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
    // See http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html
    SchemeRegistry registry = new SchemeRegistry();
    registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
    registry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
    ClientConnectionManager connectionManager = new ThreadSafeClientConnManager(params, registry);
    httpClient = new DefaultHttpClient(connectionManager, params);
  }

  @Override
  public boolean supportsHead() {
    return true;
  }

  @Override
  public boolean supportsPatch() {
    return true;
  }

  @Override
  public ApacheHttpRequest buildDeleteRequest(String url) {
    return new ApacheHttpRequest(httpClient, new HttpDelete(url));
  }

  @Override
  public ApacheHttpRequest buildGetRequest(String url) {
    return new ApacheHttpRequest(httpClient, new HttpGet(url));
  }

  @Override
  public ApacheHttpRequest buildHeadRequest(String url) {
    return new ApacheHttpRequest(httpClient, new HttpHead(url));
  }

  @Override
  public ApacheHttpRequest buildPatchRequest(String url) {
    return new ApacheHttpRequest(httpClient, new HttpPatch(url));
  }

  @Override
  public ApacheHttpRequest buildPostRequest(String url) {
    return new ApacheHttpRequest(httpClient, new HttpPost(url));
  }

  @Override
  public ApacheHttpRequest buildPutRequest(String url) {
    return new ApacheHttpRequest(httpClient, new HttpPut(url));
  }

  /**
   * Shuts down the connection manager and releases allocated resources. This includes closing all
   * connections, whether they are currently used or not.
   *
   * @since 1.4
   */
  @Override
  public void shutdown() {
    httpClient.getConnectionManager().shutdown();
  }
}