404、500的自定义错误页面，但是默认的500错误消息来自何处?

目前在生产中，我收到以下文字:

Currently in production I'm getting this text:

500 Internal Server Error
If you are the administrator of this website, then please read this web application's
log file and/or the web server's log file to find out what went wrong.

该页面上没有任何HTML.该代码位于哪里?我没有 public/500.html 文件.

There isn't any HTML on that page. Where is this code situated? I don't have a public/500.html file.

在我的路线上，我有:

  get "/404", :to => "errors#error_404"
  get "/422", :to => "errors#error_404"
  get "/500", :to => "errors#error_500"
  get "/505", :to => "errors#error_505"

ErrorsController:

ErrorsController:

class ErrorsController < ApplicationController

  def sub_layout
    "left"
  end

  def error_404
    render :status => 404, :formats => [:html], :layout => "white", :sub_layout => "left"
  end

  def error_422
    render :status => 422, :formats => [:html], :layout => "white", :sub_layout => "left"
  end

  def error_500
    render :status => 500, :formats => [:html], :layout => "white", :sub_layout => "left"
  end

  def error_505
    render :status => 505, :formats => [:html], :layout => "white", :sub_layout => "left"
  end

end

如何使其始终加载我的自定义错误?在某些错误上，它只是将这两行文本从Ruby on Rails核心抛出.我希望它每次都能提取自定义样式的错误页面！

How do I make it load my custom errors always? On some errors, it just throws those two lines of text coming somewhere from the Ruby on Rails core. I want it to pickup my custom styled error pages every time!