PATCH

The PATCH verb is used to perform a partial update, for example, if we only wanted to update the name of our cat we could make a PATCH request only containing the details that we would like to change.

Request:

PATCH /v1/cats/12343 HTTP/1.1 
Content-Type: application/json 
Content-Length: xxxx 

{"weight": 9} 

Response:

HTTP/1.1 204 No Body 
Content-Type: application/json 
Content-Length: 0 

In my experience PATCH updates are rarely used, the general convention is to use a PUT and to update the whole object, this not only makes the code easier to write but also makes an API which is simpler to understand.