油漆未干

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The basic process is as follows: An incoming HTTP request is deflected from the
server’s default document location to the home directory of the Rails application,
where a dispatcher program is executed. That dispatcher program dispatches the
request to the appropriate controller/action combination, which it figures out
from the URL (applying interpretive rules as needed). The controller then takes
over. On the one hand, the controller has access to the universe of the models,
through which it can manipulate data; and on the other hand, it has the ability to
share data with the view template. The view template gets expanded into HTML,
complete with interpolated data, and the Web server hands it back to the client.

 ----- from the <Ruby for Rails>