How to know if web-proxy is working or not?

I want to know where I could see if web-proxy is working or not, and is there in cache anything I don’t see any there?

Check the status Page..

Must there be answered requests from clients or other parameter? It shows that web-proxy is running and the time how long it is running, but no answers for clients.

yes, there must be some hits, and also the cache size should increase. if you are using a transparent proxy, don’t forget to make a DST-NAT rule to direct your users there. if you are NOT using a transparent proxy, make sure to enter the proxy address in the client’s browser settings