Your question is Request Lifecycle Through GitLab. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Describe in as much detail as you think is appropriate the lifecycle of this request and what happens in the browser, over the network, on GitLab servers, and in the GitLab Rails application before the request completes.