module<\/span> Rack<\/span>\n  # Returns a user-friendly exception page.<\/span>\n  # Should be included at the very top of the middleware pipeline so that unhandled <\/span>\n  # exceptions from anywhere down the pipeline are rescued.<\/span>\n  # In development, you'd want to use the developer-friendly Rack::ShowExceptions instead. <\/span>\n  # <\/span>\n  # config.ru example:<\/span>\n  #<\/span>\n  #   if ENV['RACK_ENV'] == 'development'<\/span>\n  #     use Rack::ShowExceptions<\/span>\n  #   else<\/span>\n  #     use Rack::PublicExceptionPage<\/span>\n  #   end<\/span>\n  #<\/span>\n  # The default HTML included here is a copy of the 500 page included with Rails<\/span>\n  # You can optionally specify your own file, ex:<\/span>\n  #<\/span>\n  #   use Rack::PublicExceptionPage, "public/500.html"<\/span>\n  class<\/span> PublicExceptionPage<\/span>\n\n    def<\/span> initialize<\/span>(<\/span>app<\/span>,<\/span> file_path<\/span> =<\/span> nil<\/span>)<\/span>\n      @app<\/span> =<\/span> app<\/span>\n      @file_path<\/span> =<\/span> file_path<\/span>\n    end<\/span>\n\n    def<\/span> call<\/span>(<\/span>env<\/span>)<\/span>\n      @app<\/span>.<\/span>call<\/span>(<\/span>env<\/span>)<\/span>\n    rescue<\/span> ::<\/span>Exception<\/span>\n      [<\/span>500<\/span>,<\/span> {<\/span>'Content-Type'<\/span> =><\/span> 'text/html'<\/span>,<\/span> 'Content-Length'<\/span> =><\/span> html<\/span>.<\/span>length<\/span>.<\/span>to_s<\/span>},<\/span> [<\/span>html<\/span>]]<\/span>\n    end<\/span>\n\n    private<\/span>\n\n      def<\/span> html<\/span>\n        @html<\/span> ||=<\/span> @file_path<\/span> ?<\/span> ::<\/span>File<\/span>.<\/span>read<\/span>(<\/span>@file_path<\/span>)<\/span> :<\/span> default_html<\/span>\n      end<\/span>\n\n      # Exception page from Rails (500.html)<\/span>\n      def<\/span> default_html<\/span>\n        <<-<\/span>EOV<\/span>\n        <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<\/span>\n               "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><\/span>\n\n        <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><\/span>\n\n        <head><\/span>\n          <meta http-equiv="content-type" content="text/html; charset=UTF-8" /><\/span>\n          <title>We're sorry, but something went wrong (500)</title><\/span>\n        	<style type="text/css"><\/span>\n        		body { background-color: #fff; color: #666; text-align: center; font-family: arial, sans-serif; }<\/span>\n        		div.dialog {<\/span>\n        			width: 25em;<\/span>\n        			padding: 0 4em;<\/span>\n        			margin: 4em auto 0 auto;<\/span>\n        			border: 1px solid #ccc;<\/span>\n        			border-right-color: #999;<\/span>\n        			border-bottom-color: #999;<\/span>\n        		}<\/span>\n        		h1 { font-size: 100%; color: #f00; line-height: 1.5em; }<\/span>\n        	</style><\/span>\n        </head><\/span>\n\n        <body><\/span>\n          <!-- This file lives in public/500.html --><\/span>\n          <div class="dialog"><\/span>\n            <h1>We're sorry, but something went wrong.</h1><\/span>\n            <p>We've been notified about this issue and we'll take a look at it shortly.</p><\/span>\n          </div><\/span>\n        </body><\/span>\n        </html><\/span>\n        EOV<\/span>\n      end<\/span>\n\n  end<\/span>\nend<\/span>\n<\/pre><\/div>\n