Generally, the flow of web services is initiated by the client by sending a request for the resource to the server. This is the traditional way of consuming web services.
Traditional Flow
Here, the browser or Jersey client initiates the request for data from the server, and the server provides a response along with the data. Every time a client needs to initiate a request for the resource, the server may not have the capability to generate the data. This becomes difficult in an application where real-time data needs to be shown. Even though there is no new data over the server, the client needs to check for it every time.
Nowadays, there is a requirement that the server needs to send some data without the client's request. For this to happen the client and server need to be connected, and the server can push the data to the client. This is why it is termed as Server-Sent Events. In these events, the connections created initially between the client and server are not released...