Gatling and http callback scenario

Gatling (Open-Source)
1

For a stress test I need to create a “complex” Gatling scenario with an application callback like this :

in the test I need to report Time-1 and Time-2.

Can you help me to create gatling test with this sequence ?

2

Are you trying to use HTTP/2 PUT?

3

I meant PUSH

4

the first response of the application is an acknowledgment of support. the
second “answer” is a new independent connection (http callback call) and can arrive X seconds later after the job is done.