Choosing a Storage API Pattern for Direct Browser Uploads: Auth and Webhooks

Short answer: use a backend-issued presigned upload, authenticate before issuing it, validate the object with a HEAD request, and add a webhook-style storage notification only when a later worker needs asynchronous processing. This is the best beginner-friendly storage API pattern for direct browser uploads because the browser moves bytes, while the backend owns identity, authorization, and the ready state. The same boundary works in a Python service or a Node/Express API. It also keeps a RAG p