I had the same problem and solved it by looking at the headers of a working
application (phpMyAdmin has excel export).
Using the following headers works for me:
//control cache, these make the difference
response.setHeader("Cache-Control",
"must-revalidate, post-check=0, pre-check=0");
response.setHeader("Pragma", "Public");
//these are xls specific
response.setHeader("Content-Disposition",
"attachment; filename=action.xls");
response.setHeader("Content-Type",
"application/vnd.ms-excel");
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