intermediate~2h
File Upload
A profile picture or a PDF invoice has to get from a browser's file picker into your storage somehow. This module is that path, plus the validation gaps that turn an upload endpoint into a security hole.
Learning objectives
- Beginner: Accept a file upload via MultipartFile and save it to disk.
- Intermediate: Validate a file upload's size and content type before trusting it.
- Advanced: Explain why storing uploads directly on the application server's disk doesn't survive a real production deployment, and what replaces it.
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File Upload