How to prevent connection timeout in long running Gateway requests?

Hello,

I have a UI5 application which calls a Gateway function import that takes a veeery long time to compute something. Therefore the client browser receives a connection timeout from the SAP NetWeaver backend while the computation is still running.

What is the best approach to prevent this timeout?

1. The timeout settings of the server should not be changed!
2. It seems the computation can neither be chopped into smaller parts nor is it an option to strap a HANA under that server
3. Is there some kind of WebSocket possibility?

Best regards,

Björn

P.S.: The system is a NetWeaver 7.40 SP8