/**
 * Returns a new connection to the resource referred to by this URL.
 *
 * @throws IOException if an error occurs while opening the connection.
 */
public URLConnection openConnection() throws IOException {
    return streamHandler.openConnection(this);
}

package com.squareup.okhttp;

import java.io.IOException;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

public class HttpHandler extends URLStreamHandler {
    @Override protected URLConnection openConnection(URL url) throws IOException {
        return newOkHttpClient(null /* proxy */).open(url);
    }

    @Override protected URLConnection openConnection(URL url, Proxy proxy) throws IOException {
        if (url == null || proxy == null) {
            throw new IllegalArgumentException("url == null || proxy == null");
        }
        return newOkHttpClient(proxy).open(url);
    }

    @Override protected int getDefaultPort() {
        return 80;
    }

    protected OkHttpClient newOkHttpClient(Proxy proxy) {
        OkHttpClient client = new OkHttpClient();
        client.setFollowProtocolRedirects(false);
        if (proxy != null) {
            client.setProxy(proxy);
        }

        return client;
    }
}