Question

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]}

Answer 1

We found the mistake.

We had an error_controller.rb containing this:

  def error_404
    @not_found_path = params[:not_found]
    render template: 'errors/error_404', layout: 'layouts/application', status: 404
  end

and we changed it to fix this problem to:

  def error_404
    @not_found_path = params[:not_found]
    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