½Ŀ¼:

5. (proxy)
   5.1. ˵
   
5. (proxy):
===================

5.1. ˵:
     
      Fikker ϵͳ, ¹:
     
     (1). , Fikker ǰû, ǷԴվ(վ)ǰķ, 
          Ƚյûӷ, ȻתûһԴվ;
     
     (2). ؾ, Fikker Դվ(վ)һ, 
          Fikker ͨòͬĸؾԽûַһ
          Դվ, ÿһԴվ(վ)Ĳͬû.
     
     ͼ1(һԶܹ):
     ==================
     +----------------------------------------------------------+               +------+
     |                                                          |     +-------> |  |
     |   +---------------+          +-------------------+       |     |         +------+
     |   |    Դվ 1     |  <-----  |                   |       |     |
     |   | 21.66.5.61:81 |  ----->  |                   | <-----------+         +------+
     |   +---------------+          |                   | <-------------------> |  |
     |                          |                   |       |               +------+
     |   +---------------+          |      Fikker       |       |
     |   |    Դվ 2     |  <-----  |                   |       |     +------+
     |   | 21.66.5.62:81 |  ----->  |       ǰ        | <-------------------> |  |
     |   +---------------+          |                   |       |               +------+
     |                          |   www.host.com    |       |
     |   +---------------+          |                   |       |               +------+
     |   |    Դվ 3     |  <-----  |                   | <-------------------> |  |
     |   | 21.66.5.63:81 |  ----->  |                   | <-----------+         +------+
     |   +---------------+          +-------------------+       |     |
     |                                                          |     |         +------+
     |                                                          |     +-------> |  |
     +----------------------------------------------------------+               +------+
                       \  /                                         \  /          \  /
                        ||                                           ||            ||
                        \/                                           \/            \/
                                                                         
     
     ͼ˵:
     һ Fikker ӦԴվ. ԶԴվиؾ, ǰû Fikker ûķ, 
     ؾýתԴվ.
     
     ͼ2(һܹ):
     ==================
     +----------------------------------------------------------+               +------+
     |                                                          |     +-------> |  |
     |                              +-------------------+       |     |         +------+
     |                              |     Fikker 1      | <-----------+
     |                         +--> |  www1.host.com    |       |               +------+
     |                         |    +-------------------+ <-------------------> |  |
     |                         |                                |               +------+
     |   +---------------+  <--+    +-------------------+       |           
     |   |     Դվ      |  <-----> |     Fikker 2      |       |     +------+
     |   | 21.66.5.60:81 |          |  news.host.com    | <-------------------> |  |
     |   +---------------+  <--+    +-------------------+       |               +------+
     |                         |                                |
     |                         |    +-------------------+       |               +------+
     |                         +--> |     Fikker 3      | <-------------------> |  |
     |                              |  tech.host.com    | <-----------+         +------+
     |                              +-------------------+       |     |
     |                                                          |     |         +------+
     |                                                          |     +-------> |  |
     +----------------------------------------------------------+               +------+
                       \  /                                         \  /          \  /
                        ||                                           ||            ||
                        \/                                           \/            \/
                                                                         
     
     ͼ˵:
     һԴվӦ Fikker.  Fikker , ֱղͬûķ, 
     ýתһԴվ.
     
     (3). Fikker ȱ, ûа취, ǲȱٵһ÷.
     
     Դվĸؾ:
     ===================
     (1). ѯ, øؾ, ڶԴվ, Fikker ԸԴվѯ;
     
     (2). IP ϣ, ڶԴվ, Fikker û IP ַ Hash ֵ, 
          پһԴվ;
     
     (3). URL ϣ, ڶԴվ, Fikker û URL  Hash ֵ, 
          پһԴվ;
