A problem with NGINX proxy buffering was seen here: https://gitlab.com/gitlab-org/gitlab-ce/issues/31871#note_29478568 A fix was added to omnibus here: https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1569 I think it makes more sense to disable request buffering in workhorse for these routes, as mentioned here: https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/62#note_30308789 - this way installation-from-source and other users can benefit too.