Look up a Rails HTTP Status Code

509 - Bandwidth Limit Exceeded

Rails HTTP Status code :bandwidth_limit_exceeded

When to use status code 509

The server has exceeded the bandwidth specified by the server administrator; this is often used by shared hosting providers to limit the bandwidth of customers.

More about HTTP status codes at

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

More about rails rendering at

http://guides.rubyonrails.org/layouts_and_rendering.html