This is the second part of the Client-Server Communication Model. You can have a look at the first part where we discussed Polling, Long Polling, and Webhooks. Here, we will focus on Server-Sent Events. 4. Server-Sent Events (SSE) Server-Sent Events (SSE) are based on server push technology enabling a client to receive automatic updates from a server via an HTTP connection. The clients make a persistent long-lived connection with the server. Then, the server uses this connection to send the data to the client. It is important to note that the client can’t send the data to the server using the SSE. It is a unidirectional way to flow data from the server to the client. The request-response flow of SSE is: The client issues an HTTP GET request to the server, with the request headers Accept: text/event-stream and Connection: keep-alive . The inclusion of Accept: text/event-stream in the request informs the server that the client aims to initiate an SSE co...