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We have a rails server with custom 404 and 500 pages setup using this tutorial here: http://ramblinglabs.com/blog/2012/01/rails-3-1-adding-custom-404-and-500-error-pages While it works nice and throws 404s for all kinds of paths, it generates internal server errors 500 while trying to access any kind of suffixed path like en/foo.png, en/foo.pdf, en/foo.xml, ... But something like en/file.foo throws 404. So only valid suffixes throw a 500. End of routes.rb: if Rails.application.config.consider_all_requests_local match '*not_found', to: 'errors#error_404' end application_controller.rb unless Rails.application.config.consider_all_requests_local rescue_from Exception, with: :render_500 rescue_from ActionController::RoutingError, with: :render_404 rescue_from ActionController::UnknownController, with: :render_404 rescue_from ::AbstractController::ActionNotFound, with: :render_404 rescue_from ActiveRecord::RecordNotFound, with: :render_404 end protected def render_404(exception) @not_found_path = exception.message respond_to do |format| format.html { render template: 'errors/error_404', layout: 'layouts/application', status: 404 } format.all { render nothing: true, status: 404 } end end def render_500(exception) logger.fatal(exception) respond_to do |format| format.html { render template: 'errors/error_500', layout: 'layouts/application', status: 500 } format.all { render nothing: true, status: 500} end end 500 that appears: Missing template errors/error_404 with {:locale=>[:de, :en], :formats=>[:png], :handlers=>[:erb, :builder, :coffee, :arb, :haml]}

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