E-Commerce Server Architecture
                         ==============================

```
    +---------+        +--------+       +--------+           +---------+
    | browser |  HTTP  |  web   |       | Perl   |  TCP/IP   |  java   |
    |   with  |<------>| server |<----->|  CGI   |<--------->| server  |
    | cookie  |  HTTPS |        |  CGI  |program |name=value |         |
    +---------+        +--------+       +--------+           +---------+
                                            ^                     ^
                                            |                     |
                                            |                     V
                                        +---------+         +-----------+
                                        |  HTML   |         |   mysql   |
                                        |templates|         | database  |
                                        |         |         |           |
                                        +---------+         +-----------+
                                                                  |
                                                     Asynchronous |
                                                       Connection |
                                                                  V
                                                            +-----------+
                                                            |   Legacy  |
                                                            | Enterprise|
                                                            |   System  |
                                                            +-----------+
```