servlet file download works in Firefox, but not in IE

Hi!There:

I wrote a java servlet to display binary files, such as html, doc, pdf, jpg
files. And the function works under firefox browser, but failed in IE with
PDF and Word file type.

Here are part of the code:
//
response.setContentType(attachment.getImage().getContentType());
      response.setContentLength(attachment.getImage().getImageSize());
      OutputStream os = response.getOutputStream();
      os.write(attachment.getContent());
      response.setStatus(HttpServletResponse.SC_OK);

//
I did some study and tried to add the following line.
response.setHeader("Pragma","public");
 And it failed as well.

Can anybody help me on this issue?

Thanks

Joshua

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