Question

I want to send data from server to client when server is updated. Normally client sends a request to server and server response to the client. Is there any way to send data to a specific client directly?

Pls guide me.

Answer 1

You seem to be after what is known as Push Technology:

Push, or server push, describes a style of Internet-based
communication where the request for a given transaction is initiated
by the publisher or central server. It is contrasted with pull, where
the request for the transmission of information is initiated by the
receiver or client.

This and this previous SO posts seem to discuss what you are after.