Description

The HTTP response status code 420 Method Failure and 420 Enhance your calm is an unofficial HTTP status code that is returned by the server to indicate a client error. When sent by the Spring Framework, it indicates that a method has failed, whereas when sent by Twitter, it indicates that the client is being rate limited for making too many requests.

Spring Framework

When the 420 Method Failure HTTP status code is sent by the Spring Framework, it indicates that a method has failed. However, this status code has been deprecated and is no longer used by Spring.

Twitter

In version 1.0 of the Twitter Search and Trends API, the 420 Enhance your calm HTTP status code was used to indicate that the client was being rate limited for making too many requests. The intention was to ease traffic by restricting clients to a certain number of requests within a specific time. With the release of Standard v1.1 of the Twitter API, this status has been deprecated, and instead, they use the official message 429 Too Many Requests