![]() ![]() However, suppose the server does not have any information available for the client. Long polling is similar to regular polling, in which the client requests information from the server. The server uses HTTP long-polling whenever it cannot establish a WebSocket connection. Socket.IO server and client implementations are available for all the major languages like JavaScript, Java, Python, Go, etc. ![]() Socket.IO is a library that allows clients and servers to communicate in real-time, bidirectionally, using an event-driven architecture. Since the connection is persistent, real-time communication between the client and the server is possible. It is a stateful protocol, meaning it will maintain the connection between the client and server until either party terminates it. WebSocket is a bidirectional, full-duplex protocol, as opposed to HTTP. WebSockets can help us to tackle this situation. Thus, we need a persistent connection between the client and the server. But for real-time communication, we cannot afford any delay. HTTP is a stateless protocol that means every time we make a request, a three-way handshake is performed, which increases the delay in response. ![]() There is one-way communication between the client and server because HTTP is a unidirectional protocol. After the data transfer is complete, the connection is closed. The HTTP protocol is an application protocol that uses the TCP protocol, which requires a three-way handshake to connect the client and the server successfully. We know that we use an HTTP request to transfer any message/data from our client to a server. ![]() But did you ever thought about how these realtime-applications built? It’s because of Socket.IO We all are familiar with real-time messaging applications and use them quite often. ![]()
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