+---------+
                 | Client1 |
                 +---------+
                   ^
                   |
                   |
                   v
+---------+      +---------+      +---------+
| Client3 | <--> |  Proxy  | <--> | Client2 |
+---------+      +---------+      +---------+
                   ^
                   |
                   |
                   v
                 +---------+
                 | Client  |
                 +---------+