Is it possible to send a request to the server when the application is not running on the phone?

Question

iOS

My application should send every 30 minutes a request to the server even if it is not running on the phone. The server then responds in JSON. If the application received a response, it should issue a Push Notification to the user with the content that was received from the server in JSON. I know how to write a request and make it request every 30 minutes, but how to make it send even if it is not running on the phone and where to write this request ??? help me please ))

Answer 1

How else to send requests to the server when the application is not even installed on the phone?

Answer 2

Background Execution

Answer 3

If the application was unloaded from memory, then I do not know how to crank out what you want.
If the application was launched and minimized, then yes, there is such a possibility: see Anton Gorb 's answer