PUT메소드는 현재 서버에 있는 대체하여 새로운 엔티티를 생성
PATCH메소드는 현재 서버에 있는 엔티티를 수정하여 새버전을 생성하는것
-> PUT메소드는 엔티티의 전체 변경 시, PATCH는 엔티티의 일부 변경 시 사용

The difference between the PUT and PATCH requests is reflected in the
way the server processes the enclosed entity to modify the resource
identified by the Request-URI. In a PUT request, the enclosed entity
is considered to be a modified version of the resource stored on the
origin server, and the client is requesting that the stored version
be replaced. With PATCH, however, the enclosed entity contains a set
of instructions describing how a resource currently residing on the
origin server should be modified to produce a new version. The PATCH
method affects the resource identified by the Request-URI, and it
also MAY have side effects on other resources; i.e., new resources
may be created, or existing ones modified, by the application of a
PATCH.

https://datatracker.ietf.org/doc/rfc5789/?include_text=1

#Concept