IOException on httpURLConnection.getInputStream();

Question

Hello !
I have written some code to transfer a HTTP Request received on a servlet... but I'm catching an IOException when getting inputstream
at the end....
I though that adding a setDoInput(true) would solve the problem but
the code stops on it instead...
Thanks to help me,
Bye,
Ludovic, France
public int transferRequest(String fullRequestURL, HttpServletRequest request, byte[] body)
     try
          // Construct URL
          URL url = new URL(fullRequestURL);
          // Open URL and get input stream ...
          HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
          // Getting request type informations (method requestURI protocol)
          String method = request.getMethod();
          // Set method
          httpURLConnection.setRequestMethod(method);
          // Set output mode to true
          httpURLConnection.setDoOutput(true);
          // Temp string used in loop statement
          String key = "";
          String value = "";
          // Then set all header parameters
     Enumeration e = request.getHeaderNames();
     while (e.hasMoreElements())
     // Get next header key
     key = (String)e.nextElement();
     // Set forward request with it
     httpURLConnection.setRequestProperty(key, request.getHeader(key));
} /* end of while */
          // Open output stream
          OutputStream outputStream = httpURLConnection.getOutputStream();
          // Write body into stream
          outputStream.write(body);
          // Flush and close the streams
          outputStream.flush();
          outputStream.close();
          //httpURLConnection.setDoInput(true);
          // Open an input stream
          InputStream urlInputStream = httpURLConnection.getInputStream();
          // Initiate byte[] to read from URL input stream
          int responseCode = httpURLConnection.getResponseCode();
          // Flush and close the streams
          urlInputStream.close();
          httpURLConnection.disconnect();
          // Return the byte array
          return responseCode;
     catch (UnknownServiceException unknownServiceException)
          unknownServiceException.printStackTrace();
     catch (MalformedURLException malformedURLException)
          malformedURLException.printStackTrace();
     catch (ProtocolException protocolException)
          protocolException.printStackTrace();
     catch (IOException aIOException)
          aIOException.printStackTrace();
     catch (Exception aException)
          aException.printStackTrace();
     // At this point, an error occured !
     return 500;
} /* end of transferRequest */

Answer 1

An info:
This code works only when using no proxy... but I must use a proxy !