hscale=auto;
CI: Client Infra {
    T: Terminal;
    C: Client;
};
SI: Server Infra [large=yes] {
    S: Server;
    B: Backend;
};
->T: Hit;
T->C: Internal Req;
C=>S: Request to Server;
S>>B: Internal Query;
S<<B: Internal Response;
C<=S: Reply from Server;
T<-C: Internal Reply;

