If you are trying to stream a spreadsheet to a browser, you'll need to define a different content-type. Browsers don't automatically know what the web server is sending, you define that in the content-type(also known as MIME). The code snippet above is telling the browser, "Hey, what I'm about to send you is text/html". So if the web server outputted excel binary code instead, the browser will render it as funny text.

In reply to Re^3: No output from CGI script when using CGI::Debug by johnny_carlos
in thread No output from CGI script when using CGI::Debug by pagespank

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