```ruby
class Projects::BadgesController < Projects::ApplicationController
  layout 'project_settings'
  before_action :authorize_admin_project!, only: [:index]
  before_action :no_cache_headers, except: [:index]

  def index
    @ref = params[:ref] || 'master'
    @build_badge = Gitlab::Badge::Build.new(@project, @ref)
  end

  def build
    badge = Gitlab::Badge::Build.new(project, params[:ref])

    respond_to do |format|
      format.html { render_404 }
      format.svg do
        send_data(badge.data, type: badge.type, disposition: 'inline')
      end
    end
  end
end
```

Use default branch when displaying list of badges
user
```ruby
class Projects::BadgesController < Projects::ApplicationController
  layout 'project_settings'
  before_action :authorize_admin_project!, only: [:index]
  before_action :no_cache_headers, except: [:index]

  def index
    @ref = params[:ref] || @project.default_branch || 'master'
    @build_badge = Gitlab::Badge::Build.new(@project, @ref)
  end

  def build
    badge = Gitlab::Badge::Build.new(project, params[:ref])

    respond_to do |format|
      format.html { render_404 }
      format.svg do
        send_data(badge.data, type: badge.type, disposition: 'inline')
      end
    end
  end
end
```
assistant