Maintenance mode

If you wish to disable access to all routes of your application and redirect every requested route to a certain route, this can be done with a maintenance route.

This can be configured in app.rb:

app.rb
class ApplicationController < Sinatra::Base
.
# Set maintenance route
maintenance enabled: true do
erb :maintenance, layout: false
end
.
.
end

This action is typically rendering a static webpage that details the reasons for maintenance:

class ApplicationController < Sinatra::Base
.
# Set maintenance route
maintenance enabled: true do
render_static '/maintenance.html'
end
.
.
end

Note that maintenance simply is just a get route, so some sort of rendering, redirecting, or other valid return must be done.