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How do I download a file with struts2 with a dialog?

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  How do I download a file with struts2 with a dialog? "e.d.pro...@gmail.com" <e.d.programmer@gmail.com> - 2023-09-01 08:23 -0700

#40008 — How do I download a file with struts2 with a dialog?

I've tried everything I can think of here. In my struts.xml file I have <result="success" type="stream"> specifying param for contentType, inputName, contentDisposition, contentLength, and bufferSize.
I'm downloading using struts, with a class extending ActionSupport, sending file contents from a method called getFileStream which returns InputStream. I've tried every value I can think of for these params and it's downloading files to my downloads folder.
If I display a PDF using iFrame, there's a download icon. If I click that, I get a "Save As" popup window. How do I get my download link to popup that window?

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