gitlab-org--gitlab-foss/config/routes/snippets.rb

resources :snippets, concerns: :awardable do
  member do
    get 'raw'
    get 'download'
  end
end

get '/s/:username', to: redirect('/u/%{username}/snippets'),
                    constraints: { username: /[a-zA-Z.0-9_\-]+(?<!\.atom)/ }