Is a caching mechanism used when performing GET requests?

Yes, caching mechanisms are often used when performing GET requests. In the HTTP protocol, GET requests are considered idempotent and safe, so their responses can be cached by browsers, proxy servers, and other intermediate nodes to improve performance and reduce server load.

Caching is controlled by HTTP headers such as Cache-Control, Expires, ETag, and Last-Modified. For example, a server can specify that a response can be stored in cache for a certain period or use conditional request mechanisms to verify data freshness.

Example cache headers:

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