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How do you handle file uploads and downloads?

Senior Python
Quick Answer File uploads: Django: request.FILES, FileField/ImageField model fields. Validate file size and type. Store: locally (FileSystemStorage), S3 (django-storages with boto3). Flask: request.files, werkzeug.secure_filename() to sanitize filenames. FastAPI: UploadFile type. Always validate MIME type server-side (not just extension). Downloads: StreamingResponse for large files to avoid memory issues.

Answer

Validate file types and sizes.
Store files securely.
Use streaming for large downloads.
CDNs improve performance.
S
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