Get HTML source using HttpClient

HttpClient version : 3.1

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.methods.GetMethod;

public class Test {

    private String getHtmlSource(String url, String encoding) throws IOException {
        HttpClient client = new HttpClient();
        HttpMethod method = new GetMethod();

        method.setRequestHeader("user-agent", "Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-TW; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1");
        method.setRequestHeader("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        method.setRequestHeader("accept-language", "en-us;q=0.7,en;q=0.3");
        method.setRequestHeader("accept-encoding", "gzip,deflate");
        method.setRequestHeader("accept-charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
        method.setRequestHeader("keep-alive", "300");
        method.setRequestHeader("connection", "keep-alive");

        InputStream is = null;
        GZIPInputStream gzip = null;
        InputStreamReader isReader = null;
        BufferedReader bReader = null;
        client.executeMethod(method);

        is = method.getResponseBodyAsStream();
        if (method.getResponseHeader("Content-Encoding") != null && method.getResponseHeader("Content-Encoding").getValue().equalsIgnoreCase("gzip")) { // 若有壓縮
            gzip = new GZIPInputStream(is);
            isReader = new InputStreamReader(gzip, encoding);
        } else {
            isReader = new InputStreamReader(is, encoding);
        }
        bReader = new BufferedReader(isReader);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = bReader.readLine()) != null) {
            sb.append(String.format("%s ", line));
        }

        if (bReader != null)
            bReader.close();
        if (isReader != null)
            isReader.close();
        if (gzip != null)
            gzip.close();
        if (is != null)
            is.close();

        method.releaseConnection();
        return sb.toString();
    }
}