214 Transformation Applied
HTTP Warning status code 214 Transformation Applied is an unofficial HTTP status code, but instead is used in combination with the Warning HTTP Header and included with HTTP response messages to indicate that a transformation has been applied to the representation.
The HTTP status code 214 Transformation Applied and the Warning HTTP header have been deprecated.
An example of this is the compression of data, changing the Content-Encoding HTTP header.
Warning: 214 www.example.re "Lossy compression applied"