Is caching provided in REST API? Which methods are cached?

Caching in REST API is provided and is an important part of optimizing performance and reducing server load. Typically, responses to GET requests are cached, as they should be idempotent and not change the server state.

Methods that are most often cached:

• GET — the main method for retrieving data, its responses can be cached using HTTP headers Cache-Control, ETag, Last-Modified.
• HEAD — similar to GET, but without the response body, can also be cached.

Methods that change state (POST, PUT, DELETE, PATCH) are generally not cached, as their responses can vary and affect data.

Example of an HTTP header for caching a GET response:

Cache-Control: public, max-age=3600
ETag: "33a64df551425fcc55e4d42a148795d9f25f89d4"