WebSocket
ProtocolsWebSocket is a network protocol that creates a persistent, full-duplex connection between a client (usually a browser) and a server over a single TCP socket. After an HTTP-based handshake, it upgrades to a message-oriented channel that allows real-time data to flow in both directions with low overhead, making it well suited for interactive web applications.
How It Works
A WebSocket connection starts as a normal HTTP request that includes an Upgrade header. If the server supports WebSocket, it responds with an acceptance message and the connection switches protocols, keeping the same underlying TCP connection open. From that point, client and server exchange framed messages (text or binary) without repeating HTTP headers on every interaction.
Because the channel is full-duplex, the server can push updates at any time instead of waiting for the client to poll. WebSocket commonly runs over TLS as wss://, which encrypts traffic like HTTPS. In production hosting environments, WebSocket traffic often passes through reverse proxies or load balancers (for example, Nginx) that must be configured to allow connection upgrades, long-lived connections, and appropriate timeouts.
Why It Matters for Web Hosting
If your application needs real-time updates, your hosting plan must support long-lived connections and the HTTP Upgrade mechanism end to end. When comparing hosts, look for compatibility with WebSocket behind proxies and CDNs, configurable idle timeouts, and enough CPU and memory to handle many concurrent open sockets. Also consider whether your stack (Node.js, Python, Java, or PHP via a gateway) is supported and whether TLS termination and firewall rules allow wss:// traffic.
Common Use Cases
- Live chat and customer support widgets
- Real-time dashboards, monitoring, and analytics updates
- Multiplayer games and collaborative editing
- Notifications, presence indicators, and activity feeds
- Streaming market data, IoT telemetry, or device control panels
WebSocket vs HTTP Long Polling
WebSocket keeps one upgraded connection open and allows true two-way messaging, which reduces repeated request overhead and improves latency for frequent updates. HTTP long polling emulates server push by holding a request open until data is available, then immediately reopening another request; it is simpler to deploy but can increase bandwidth and server load due to repeated HTTP headers and connection churn. On restrictive networks, long polling may be more compatible, while WebSocket typically performs better when supported by your hosting and proxy configuration.