Invalid request for HTTP request from Java

I've written the following code to retrieve data from HTTP url:
byte [] buffer = new byte[1024];
               URLConnection conn = src.openConnection();
               //conn.setRequestProperty("Range", "bytes=" + (start + completed) + "-" + end);
               //System.out.println("bytes=" + (start + completed) + "-" + end);
               System.out.println("Response: " + ((HttpURLConnection)conn).getResponseCode());
               BufferedInputStream bin = new BufferedInputStream(conn.getInputStream());
               byte [] data = new byte[1024];
               int readLen;
               manager.addConnected();
               while((readLen = bin.read(data)) != -1 && canContinue) {
                    dest.seek(start+completed);
                    dest.write(data, 0, readLen);
                    completed += readLen;
                    System.out.println(readLen + "\t" + completed);
               dest.close();
               System.out.println("Read: " + readLen);
          } catch(IOException e) {
               manager.failConnection();
          }However, the response code printed is -1 and the following content is written to the file (dest is a random access file, you can ignore the seek(), it is needed when I start multi-threading).
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>ERROR: The requested URL could not be retrieved</TITLE>
<STYLE type="text/css"></STYLE>
</HEAD><BODY>
<H1>ERROR</H1>
<H2>The requested URL could not be retrieved</H2>
<HR noshade size="1px">
<P>
While trying to process the request:
<PRE>
GET /ubuntu/pool/main/f/firefox/firefox_2.0.0.2+0dfsg-0ubuntu0.6.10_i386.deb HTTP/1.1
User-Agent: Java/1.6.0
Host: security.ubuntu.com
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
</PRE>
<P>
The following error was encountered:
<UL>
<LI>
<STRONG>
Invalid Request
</STRONG>
</UL>
<P>
Some aspect of the HTTP Request is invalid. Possible problems:
<UL>
<LI>Missing or unknown request method
<LI>Missing URL
<LI>Missing HTTP Identifier (HTTP/1.0)
<LI>Request is too large
<LI>Content-Length missing for POST or PUT requests
<LI>Illegal character in hostname; underscores are not allowed
</UL>
<P>Your cache administrator is <A HREF="mailto:root">root</A>.
<BR clear="all">
<HR noshade size="1px">
<ADDRESS>
Generated Fri, 16 Mar 2007 11:14:48 GMT by inet (squid/2.6.STABLE3)
</ADDRESS>
</BODY></HTML>Where does the problem lie? It failed for other URLs too. Can I establish more than one connection by invoking openURLConnection() on the same URL object?

Ive run into this issue also. I need a way for a portlet to change to its maximized state for the purposes of user registration. Is there anyway this can be done? I know that sun jsp "Providers" which are shown on their example desktop, have some sort of maximized state that they can go into, but im not sure how to use this in a portlet.
There seems to be very inconsistent support between the proprietary sun provider api, and the portlet api.

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