No Strict-Transport-Security disable option
I think there is no option to disable the HSTS Header which is send.
In this commit (puiterwijk/omnibus-gitlab@57c4d84d) was an option for nginx added but the header is now set in rails in this file: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/controllers/application_controller.rb#L181
I think it would be nice to have a config option for this.