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How to Build a Secure File Download Site Using Flask, Private Storage, and a VPS

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A developer has detailed a practical workflow for delivering controlled software downloads to clients using HTML, a Flask backend, and private object storage such as Qiniu, AWS S3, or Cloudflare R2. The setup keeps installer binaries off the VPS entirely, instead storing them in a private bucket and generating time-limited signed URLs server-side so secrets never reach the browser. A small VPS running Nginx as a reverse proxy, Gunicorn as the application server, and Certbot for HTTPS is sufficient to serve the download page and handle API requests. Rate limiting per IP, asset cache-busting, and systemd process management are highlighted as critical details that prevent common freelance delivery failures. The author also advises agreeing on acceptance criteria — including URL expiry, mobile compatibility, and paid re-upload rounds — with clients before writing a single line of code.

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