samdeepthink

Aug 18, 2026 · Fundamentals

Why Does HTTP Still Use multipart/form-data for File Uploads?

The article explains why the three‑decade‑old multipart/form-data format remains the standard for HTTP file uploads, detailing its encoding rules, how it differs from application/x-www-form-urlencoded, the structure of multipart requests, server‑side processing advantages, and why newer alternatives have not replaced it.