What logic of client-server interaction should be used?

Question

PHP

There is a certain mobile application that takes news from the server.
The list of news is taken. And by clicking on a specific news, detailed information on the news is taken, which is then stored in the application cache (?).
The list will be picked up when you open the list of news in the application. Or by timeout (10 minutes).
And how do you know that some news has appeared/updated without getting the entire list? That is, how can you implement server-client feedback?

Answer 1

You pass the identifier or timestamp of the last received news to the server, it returns all the news that appeared after it.

Answer 2

Requesting a list of updated news for a certain period will probably be the easiest

Answer 3

I join the answers above, I can only add on my own, if the news is sorted by date, and not by ID (a situation when the news with the date is older than the existing records), you need to transfer exactly the timestamp or date.

Answer 4

You can also use long polling requests