+--------+      +--------+        +---------+
| Alice  |      |  Bob   |        | Server  |
|        |      |        |        |         |
+--------+      +--------+        +---------+
     |               |                 |     
     |-----Hello---->|                 |     
     |               |                 |     
     |<--Hi-there!---|                 |     
     |               |                 |     
     |----------Request-data---------->|     
     |               |                 |     
     |<-----------Response-------------|     
     |               |                 |     
     |               |-Another request>|     
     |               |                 |     
     |               |Another-response-|     
     |               |                 |     
