Polling, SSE, or WebSockets: Choosing the Right Upload Status Transport for Mobile

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A technical analysis published on DEV Community examines the tradeoffs between HTTP polling, Server-Sent Events (SSE), and WebSockets for delivering file upload status updates on mobile browsers. The piece argues that defining clear state transitions — such as accepted, queued, processing, and ready — should precede any transport decision. HTTP polling is recommended as the default for most guest upload pages due to its reliability across proxies and natural recovery after mobile network interruptions, while SSE suits server-only push scenarios with proper heartbeat and reconnection handling. WebSockets are advised only when frequent bidirectional communication is required, as they introduce significant connection management complexity for simple status use cases. The author also highlights security considerations, including scoping subscriptions to authorized upload IDs and avoiding access tokens in loggable URLs.

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