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Heroku has a mechanism for displaying custom error and maintenance pages, served off of S3. https://devcenter.heroku.com/articles/error-pages#customize_pages h

• le_isms 14y ago
  The earlier Heroku outage also brought down custom error pages. Our site was only displaying a 500 server error via nginx.
  • Snappy 14y ago
    But was it serving _your_ 500 error page? In which case you could make it say anything you want. Heroku platform errors are not 500s; they're 502s (or 503s, I forget).