Cache Revalidation

Cache revalidation is the process a cache uses to check with the Origin Server to verify if a stored file is still up-to-date. Instead of simply re-downloading the file, the cache sends a conditional request using headers like an ETag. If the file on the server has not changed, the server responds with a lightweight 304 Not Modified status, confirming that the cache can continue to use its stored copy. This process is highly efficient as it avoids transferring the full file if it's not necessary.