Web程序框架：概览

关于Web程序框架的思考概览如下。

                              base
                       /------------------\
                      /      args[]        \
                     /      +-----+         \
                    /       |     |          \
 http://www.site.com/subsite/c-021/app/subapp/arg1/arg2?q=qstring
       \___________/\______/\____/\_________/\________/ \_______/
          server      root  |realm    app      argv[] |  qstring
                            |_________________________|
                                      path                   

 ============================ $env[] ==============================

  +----------+              +----------+      +-------------+
  |  Client  |              |  Server  |      |   HttpApp   |
  |----------|              |----------|      |-------------|
  |          | HttpRequest  |          |      |             |
  | cookie   +--------------> Session  |      |             |
  | .css     |              | Auth     +------>  dispatch() |
  | .js      <--------------+          |      |             |
  |          | HttpResponse |          |      |             |
  |          |              |          |      |             |
  +----------+              +----------+      +-----+-------+
                                                    |
                                     $env[]         |
                              +---------------------+
                              |    
                              |                     
 +---------------+      +-----v-------+      +--------------+
 | HttpPageModel |      |  HttpPage   |      | HttpPageView |
 | --------------|      |-------------|      |--------------|
 |               |      |  $env[]     |      |              |
 |               |      |  $argc      |      |              |
 |               +------>  $argv[]    +------>              |
 |               |      |  $args[]    |      |              |
 |               |      |             |      |              |
 |               |      |             |      |              |
 +------^--------+      +-----^-------+      +-------^------+
        |                     |                      |
        |                     |                      |
        |                     |                      |
 +------+---------------------+----------------------+------+
 |                    Helper & Model                        |
 |----------------------------------------------------------|
 |     DbUtil   Paginator                                   |
 |                                                          |
 +----------------------------------------------------------+

所有的一切从一个客户端(Client)发出的URL请求开始。这个URL在服务器端(Server)被解析并映射到一个特定的程序(HttpPage)。
这个HttpPage调用各种资源，生成响应返回给客户端。