override not_found sinatra application

Question

sinatra (= 1.4.5)

I want to render a custom 404 message for specific routes, in this case, the text 'Not found'

class App < Sinatra::Application 

  not_found do
    'You suck'
  end

  get '/404page' do
    halt 404, 'Not found'
  end 
end

I have found that no matter what I do, the text from the not_found block is invoked any time response status is set to 404, when all I really want is the text from the halt.

May be a duplicate of Override Sinatra default NotFound error page but I have not been able to find the soution.

Answer 1

Overriding error Sinatra::NotFound seems to be a better choice to handle 404 when a specific route is not found.

error Sinatra::NotFound do
  'You suck'
end

get '/404page' do
  halt 404, 'Not found'
end