What does “server initiates a request” refer to?

The phrase “server initiates a request” refers specifically to the scenario where the server is actively pushing updates to the client. This indicates that the server takes the initiative to send data or updates without the client having to ask for them. In contrast to a traditional client-server model where the client requests data from the server, this model allows the server to notify the client of changes, new information, or other relevant updates, thus enabling real-time communication.

This concept is often implemented in applications that require constant updates, such as messaging applications or live data feeds, where the server needs to send information to the client as soon as it becomes available. This is a critical aspect of modern web applications and services, allowing for more dynamic interactions and user experiences.