I'm having a little difficulty following your question. See How do I post a question effectively?. If my comments below are off-point, let me know and we can try to approach a solution.
To create a temporary directory, I use tempdir from File::Temp. It handles issues of uniqueness and can clean up when you are done, which is incredibly helpful for web projects.
Is there a reason you need to literally create a text file rather than just returning text to the browser, which is the usual approach? If you want to do things like trigger a 'save to desktop' type response, you can use the MIME header Content-Disposition to specify intent, though what action the user takes is up to them. I guess I'm just unclear what you expect the user to do that is different between visualizing and downloading your document.
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.
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