关于JSP输出图片的问题

使用tomcat6.0程序正常
使用resin3.1.8不正常
报错为：

Java code:

java.io.IOException: can't clear response after writing headers



JSP代码如下
Java code:

<%@page contentType="image/jpeg"%>
<%@page import="java.io.InputStream"%>
<%@page import="java.net.URLConnection"%>
<%@page import="java.io.OutputStream"%>
<%@page import="java.io.BufferedInputStream"%>
<%@page import="java.io.FileOutputStream"%>
<%@page import="java.net.HttpURLConnection"%>
<%@page import="java.net.URL"%>
<%
String pic_url = request.getParameter("picurl");
try {
OutputStream os = response.getOutputStream();
URL url = new URL(pic_url);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(20000);
connection.setReadTimeout(20000);
connection.setRequestProperty("Referer", pic_url);
connection.setRequestProperty("Accept-Encoding", "gzip,deflate");
connection.setRequestProperty("User-Agent","Mozilla/4.0 (compatib