Browser           View              Controller      Model
    .                 .                 .               .
    . HTTP Request    .                 .               .
    +---------------------------------->+               .
    |                 .                 | update model  .
    |                 .                 +-------------->+
    |                 .                 |               |
    |                 .                 | return status |
    |                 .                 +<--------------+
    |                 .     select view |               .
    |                 +<----------------+               .
    |                 |                 .               .
    |                 | query state     .               .
    |                 +-------------------------------->+
    |                 |                 .               |
    |                 |                 .  return state |
    |                 +<--------------------------------+
    |   HTTP Response |                 .               .
    +<----------------+                 .               .
    .                 .                 .               .