opera url transformition

package opm;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.servlet.ServletInputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.*;

@SuppressWarnings("serial")
public class OpmServlet extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
if (req.getParameter("test") == null) {
resp.sendRedirect("http://www.google.com/");
} else {
resp.getWriter().printf("Hello Opera Mini Server! Fuck GFW!");
}
}

public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
try {
URL url = new URL("http://server4.operamini.com");
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/xml");
connection.setRequestProperty("User-Agent", "Java/1.6.0_15");
connection.setRequestProperty("Connection", "keep-alive");
int length;
byte[] buffer = new byte[1024];
ServletInputStream req_in = req.getInputStream();
OutputStream con_out = connection.getOutputStream();
while ((length = req_in.read(buffer)) != -1) {
con_out.write(buffer, 0, length);
}
con_out.flush();
con_out.close();
req_in.close();
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
resp.setHeader("Content-Type", "application/octet-stream");
resp.setHeader("Cache-Control", "priavte, no-cache");
InputStream con_in = connection.getInputStream();
ServletOutputStream resp_out = resp.getOutputStream();
while ((length = con_in.read(buffer)) != -1) {
resp_out.write(buffer, 0, length);
}
} else {
resp.sendError(connection.getResponseCode());
}
} catch (Exception e) {
resp.sendError(HttpURLConnection.HTTP_UNAVAILABLE);
}
}

}