About the condition which squid caches an object into memory.

Issue

• When the customer shifted the proxy server to the production system, Squid returned an old object(test data) in memory to the client.
• So the customer is wondering how the cache mechanism of Squid works due to the return of an old object(test data).
• The customer is asking for the conditions in which squid caches an object into memory and deletes it from memory.