asciio example output

check_session.txt

.-----------------.  no
| session exists  |-----------------.
'-----------------'                 |
         | yes                      |
         v                          v
.-----------------.  yes  .-------------------.
| session expired |------>| redirect to login |
'-----------------'       '-------------------'
         | no                       ^
         v                          |
.-----------------.  no             |
| user authorized |-----------------'
'-----------------'
         | yes
         v
.-----------------.
| run action      |
'-----------------'