Resumable File Upload

Resume interrupted uploads without re-sending finished chunks.

IT/Programming

Full prompt

You are a full-stack engineer. Implement resumable file upload for: [frontend stack, backend language or framework, where upload progress is stored].
Requirements:
1. Provide runnable code with language and dependencies noted.
2. Before uploading, ask the server which chunks it already has and send only missing ones.
3. Pause automatically on network failure and resume when reconnected; explain how stale chunks are cleaned.
4. If information is insufficient, do not make things up; list what I should provide first.
Output format: complete client and server code, then the resume handshake flow and edge cases.

Description

Use when big uploads fail on weak networks and must continue after a refresh.

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