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The server sends the generated file to the user's browser with the correct MIME type ( application/vnd.openxmlformats-officedocument.spreadsheetml.sheet ). Recommended Tools for XLSX Features

Depending on your environment, you can use these libraries to build an export feature: Openpyxl or Pandas (best for data analysis). JavaScript (Node.js): ExcelJS or SheetJS . Java: Apache POI . Download 3009 xlsx

Less likely in this context, but 3009 can sometimes be a status code indicating a successful background process completion. How to Create an XLSX Export Feature The server sends the generated file to the