............................          ..............................
 .                          .          .                            .
 .                +-------+ .          . +-------+                  .
 .                |       | .          . |       |                  .
 .                | Proxy |------------- | Proxy |                  .
 .                |   1   | .          . |  2    |                  .
 .                |       | .          . |       |                  .
 .              / +-------+ .          . +-------+ \\               .    
 .             /            .          .            \\              .
 .            /             .          .             \\             .
 .           /              .          .              \\            .
 .          /               .          .               \\           .
 .         /                .          .                \\          .
 .        /                 .          .                 \\         .
 .       /                  .          .                  \\        .
 .   +-------+              .          .                +-------+   .
 .   |       |              .          .                |       |   .
 .   |       |              .          .                |       |   .
 .   | UA 1  |              .          .                | UA 2  |   .
 .   |       |              .          .                |       |   .
 .   +-------+              .          .                +-------+   .
 .              Domain A    .          .   Domain B                 .
 ............................          ..............................