问题
I'm trying to get a custom 500 error page to show on Heroku, running rails 3.2.11
I've followed the steps at: https://devcenter.heroku.com/articles/error-pages
The process worked fine for the maintenance page, but doesn't seem to work for the error page. I'm positive the S3 URL is correct in Heroku, and when I visit the S3 URL directly I can view the error page just fine (it is set to public).
config.consider_all_requests_local is set to false in production.rb
Any ideas as to why Heroku is not showing it? I just get a blank screen in various browsers (Chrome says it's a 500 error but doesn't render a page).
回答1:
The heroku's custom error page isn't displayed whenever an exception occurs in your application.
Your application is responsible for displaying this kind of pages.
See using exceptions_app with rails 3.2.
The error page happens when an error occurs with heroku.
The devcenter page about error pages says, about testing your error page :
To test your error page, you can push a bad deploy such as putting a syntax error into a key configuration file, or by creating a path on your app that sleeps for 35 seconds (thereby triggering the error H12 Request Timeout.
来源：https://stackoverflow.com/questions/16351239/500-error-page-not-showing-on-heroku