NestJS: A Guide to WebSocket Implementation

WebSockets are a communication protocol that enables bidirectional, real-time communication between clients and servers over a single, long-lived connection. Unlike traditional HTTP, which follows a request-response model, WebSockets provide a full-duplex communication channel where both the client and server can send messages independently at any time.

1. Bidirectional Communication: WebSockets allow data to be sent and received in both directions simultaneously. This enables real-time updates and interactions between the client and server.
2. Full-Duplex Communication: Unlike traditional HTTP, where a client sends a request and waits for a response, WebSockets provide full-duplex communication. This means that both the client and server can send messages independently without waiting for each other.
3. Persistent Connection: WebSockets establish a long-lived connection between the client and server. Once the connection is established, it remains open until either the client or server decides to close it. This persistent connection eliminates the need to repeatedly open and close connections for each communication.
4. Low Latency: WebSockets reduce latency by avoiding the overhead of opening a new connection for each communication. This makes them suitable for applications that require real-time updates…