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Google HTTP Client Library for Java. Functionality that works on all supported Java platforms, including Java 5 (or higher) desktop (SE) and web (EE), Android, and Google App Engine.

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package com.google.api.client.http.javanet;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.Proxy;
import java.net.URL;

/**
 * Default implementation of {@link ConnectionFactory}, which simply attempts to open the connection
 * with an optional {@link Proxy}.
 */
public class DefaultConnectionFactory implements ConnectionFactory {

  private final Proxy proxy;

  public DefaultConnectionFactory() {
    this(null);
  }

  /**
   * @param proxy HTTP proxy or {@code null} to use the proxy settings from 
   *     system properties
   */
  public DefaultConnectionFactory(Proxy proxy) {
    this.proxy = proxy;
  }

  @Override
  public HttpURLConnection openConnection(URL url) throws IOException {
    return (HttpURLConnection) (proxy == null ? url.openConnection() : url.openConnection(proxy));
  }
}