Use a live connection only when users need updates quickly enough to justify it. Server-Sent Events (SSE) fit one-way server-to-browser updates; WebSockets fit frequent two-way communication. Polling or scheduled work can be simpler when a delay is acceptable. The right choice depends on freshness, direction, recovery requirements, and how the system will behave in production—not on whether a live-update demo works.
Start with the product requirement, not the transport
Before choosing SSE, WebSockets, polling, or a scheduled job, answer four questions:
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- Who sends updates? If only the server sends information to the browser, a one-way transport may be enough. If the browser must also send frequent messages over the same connection, consider a two-way transport.
- How stale can the screen be? A few seconds, several minutes, and an hour are different requirements. Choose an update interval or delivery pattern that meets the actual freshness expectation.
- What should happen after a disconnect or failure? Decide whether a missed update can be recovered, whether the latest state is sufficient, or whether every event must be accounted for.
- What can the deployment support? Long-lived connections need compatible proxy and worker behavior; repeated requests need a reasonable request budget; scheduled jobs need clear retry and completion rules.
“Real time” is often shorthand for “without a manual refresh,” not a precise delivery guarantee. Make the acceptable delay and failure behavior explicit before building around that phrase.
Choose the update pattern that fits
| Pattern | Direction | Good fit | Main trade-off |
|---|---|---|---|
| Server-Sent Events (SSE) | Server to browser | Feeds, status changes, and notifications where the client mainly listens | Long-lived streams require suitable infrastructure and application-level recovery if missed events matter |
| WebSockets | Two-way, full-duplex | Messaging, games, or collaboration with frequent client and server updates | Requires a full-duplex connection model even when the product needs only server-to-client updates |
| Polling | Client requests; server responds | Slow-changing information, simpler implementations, or environments without streaming support | Requests may return no new data; shorter intervals increase request frequency |
| Long polling | Client request held until an event or timeout, then repeated | Near-event updates in a request-response environment | The client must repeat requests after each response or timeout |
| Scheduled work | Work runs on a schedule; delivery depends on the application | Periodic tasks or work for which a delay is acceptable | Retries, overlapping runs, job ownership, and completion need explicit handling |
Use SSE for one-way live updates
SSE keeps an HTTP connection open so the server can send events to a browser. It is a natural fit when the browser needs to receive updates but does not need to send frequent messages back over that same connection. Eric Bidelman describes the distinction in web.dev’s overview: “SSEs send information in one direction, thus you won’t receive updates from the client.” Read the web.dev overview of server-sent events.
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The browser’s EventSource API reconnects when a stream closes. An event can include an id; on reconnection, the browser can send the last event ID so an application can resume from that point. These mechanisms help with continuity, but they do not themselves store events or guarantee replay. If a consumer must not miss events, the application needs a durable source and defined replay behavior.
Use WebSockets when both sides need the live channel
WebSockets provide full-duplex communication: the client and server can both send messages over a live connection. That capability is useful when the interaction genuinely involves frequent traffic in both directions, such as a game or collaborative session. If the browser only listens for server updates, SSE may meet the requirement with a simpler one-way model.
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Polling means the client requests the latest information repeatedly. It is easy to reason about and can be a good fit for a slow-changing status page or an environment where streaming is inconvenient. Set the interval according to how fresh the information must be and how many requests the service can handle. A poll can return no change, so very frequent polling may add work without improving the experience.
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Use long polling when requests should wait for an event
With long polling, the server holds a request until new information is available or a timeout occurs; the client then sends another request. It can provide near-event updates while retaining a request-response pattern, but it is still a repeated-request design rather than a persistent two-way channel.
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Use scheduled work when immediacy is not required
A cron-style schedule is suitable for periodic work or for updates where waiting until the next run is acceptable. It is not automatically a replacement for interactive event delivery: a schedule determines when work is attempted, not whether a browser sees a change immediately. For reliable jobs, define how a run is claimed, what happens after failure, whether runs may overlap, and how completion is recorded. A scheduled event or job should not be confused with a live dashboard connection; Naven’s events overview, for example, describes schedules creating events for workers and distinguishes that durable work from dashboard updates.
Plan for disconnects and deployment behavior
Know what SSE reconnect does—and does not do
MDN documents SSE streams as text/event-stream: text events are separated by a blank line, and the browser can reconnect after a closed stream. An event ID and the reconnecting client’s Last-Event-ID can help the application continue from a prior event. The application still has to decide whether to retain events, how long to retain them, and what to do when a requested event is no longer available. MDN’s SSE guide explains stream formatting and reconnection.
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Check proxies, workers, and connection limits
A long-lived stream can be disrupted if a reverse proxy buffers the response or closes it prematurely. The server’s worker and queue arrangement also matters: the process handling a stream must be able to receive the relevant updates. Galaxy Project’s documentation for its in-development operations guide illustrates these concerns and includes polling fallbacks when SSE is disabled; its exact configuration is project- and version-specific, not a universal recipe. See Galaxy Project’s SSE operations guide.
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Make the decision with a small checklist
- Choose SSE if updates flow mainly from server to browser, users need them promptly, and your infrastructure can support reliable streams.
- Choose WebSockets if the client and server both need frequent messages over the same live connection.
- Choose polling if information changes slowly, a defined delay is acceptable, or streaming is not a good fit for the environment.
- Choose long polling if near-event responses are useful but a request-response approach is preferable.
- Choose scheduled work if the work is periodic or the product can tolerate waiting for a scheduled run; make job recovery and completion explicit.
Then test the failure path, not just the happy-path demo: disconnect a client, allow a job to fail, and verify that the interface either catches up or clearly reflects the current source of truth. The transport determines how updates move; it does not by itself establish whether they are durable, complete, or safe to miss.
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