TL;DR
A single multipart POST throws away the whole upload when the connection blinks. The tus protocol fixes that with HTTP-based resumable uploads. We'll stand up a Node @tus/server endpoint, wire a tus-js-client browser uploader, then kill the network mid-upload and watch it resume from the exact offset.
What we're building
A tiny upload app: a Node server that accepts resumable uploads and stores them (disk first, then S3), and a browser page that uploads a large video file and survives an interrupted connection. By the end you'll understand the three HTTP requests that make tus work, and you'll have a demo that resumes instead of restarting.
Versions: @tus/server 1.x, @tus/file-store, tus-js-client 4.x, Node 22.x. (tusd v2 exists in Go too; we'll use the Node server here.)
