Hey! I have a question. Suppose we have server with multiple SSL sites. We use SSL cache. What is appropriate way to do it?

a. Global ssl_session_cache in http section like:
ssl_session_cache shared:SSL:50m;

or

b. Local ssl_session_cache in server sections like:

server {
..
ssl_session_cache shared:SSL1:10m;
..
}

NOTE: Different servers, different keys.

Thanks!