ivolo/express-rate — pull request #9 by qmlab (2014-12-21 07:17:49+00:00)
Title: Updated the status code for over limit based on RFC 6585

420 is not commonly used for over rate limit. Suggest follow RFC 6585 and use 429 - Too Many Requests. Also, the original one did not set status code but enveloped it. Changed it to status code.