WebSocket is a communication protocol that keeps a single, persistent, two-way connection open between a client and a server, letting either side send messages at any time.
What is a WebSocket?
WebSocket sits on top of a single TCP connection and is commonly used for in-app chat, live sports scores, multiplayer games, collaborative editing, and other features that need updates to travel in both directions without the client asking first. It differs from HTTP, which opens a new request for every exchange; a WebSocket connection is negotiated once with an HTTP handshake and then stays open for the life of the session. Most production deployments pair it with a fallback protocol, such as Server-Sent Events or long polling, for corporate networks and older proxies that block WebSocket traffic. Because the connection is stateful, teams responsible for it also have to handle reconnection after a network drop and decide how much state to hold in memory per connection versus in a shared store.
Why WebSocket Matters
WebSocket removes the delay and waste of HTTP polling, where an app repeatedly asks the server "anything new?" and usually gets nothing back. For an engineering team, that decision affects both the user experience and the infrastructure bill: a chat message can appear in under 100 milliseconds instead of waiting for the next poll, and the server handles one open connection per user instead of thousands of short-lived requests. For a product team, WebSocket is what makes typing indicators, live reactions, presence status, and instant feed updates feel immediate rather than laggy.
How WebSocket Works
A WebSocket connection starts as an ordinary HTTP request that asks the server to "upgrade" the connection. If the server agrees, the two sides switch protocols and keep the socket open until one of them closes it. From that point, messages travel in lightweight frames in both directions with no request-response pairing required.
| Approach | Connection model | Typical latency | Server load per user |
|---|---|---|---|
| HTTP polling | New request every few seconds | Equal to the poll interval (2 to 30 seconds) | High: constant requests, mostly empty |
| Long polling | Request held open until data arrives, then repeated | Under 1 second, but reconnect gaps | Medium: one held request at a time |
| WebSocket | One persistent, two-way connection | Tens of milliseconds | Low: one idle socket, traffic only when data moves |
| Server-Sent Events | One persistent, server-to-client stream | Tens of milliseconds | Low, but one-directional |
Worked example: a chat app with 50,000 concurrent users polling every 5 seconds generates 10,000 requests per second, almost all returning no new data. The same app on WebSocket holds 50,000 idle connections and only transmits when someone actually sends a message. If users send 2 messages per minute on average, that is roughly 1,700 messages per second delivered instantly, with no wasted round trips.
Engineering teams also need to plan for reconnection logic, heartbeat pings to detect dropped connections, and horizontal scaling of connection servers, since each persistent socket consumes server memory.
WebSocket and social.plus
social.plus provides engagement infrastructure for consumer apps, and real-time delivery is central to that. Chat, live streaming interaction, feed updates, and presence all depend on a persistent connection layer so that a message posted by one user reaches everyone else without a refresh. Brands that integrate social.plus SDKs get this transport layer as part of the infrastructure rather than building and scaling their own connection servers, which is typically the hardest and most expensive part of shipping real-time features in-house. Betgames runs live interactive features for 200M users, a scale at which connection management is an infrastructure problem, not a feature.
Key Takeaways
- WebSocket holds one persistent, two-way connection open, so messages arrive in milliseconds without repeated requests.
- Compared with HTTP polling, it cuts both latency and server load, which matters most at high concurrency.
- Real-time features such as chat, live reactions, and presence depend on WebSocket or an equivalent persistent transport.
- social.plus delivers this connection layer as part of its engagement infrastructure, so brands do not have to build and scale it themselves.