正向代理和方向代理的区别和使用
| 正向代理和方向代理的区别和使用 | |||
| 请求中扮演的角色 | 客户端 | 代理服务端 | 内容服务端 |
| 正向代理 | 需设置代理，通过代理服务端请求内容服务端的资源 | 代替客户端请求内容服务端 | 只能获取代理服务端的请求内容并返回 |
| 方向代理 | 无需设置，请求代理服务端的资源 | 本身并无资源，获取内容服务端资源返回给客户端 | 只能获取代理服务端的请求内容并返回 |
| 用途 | |||
| 正向代理 | 正向代理的典型用途是为在防火墙内的局域网客户端提供访问Internet的途径。 | ||
| 正向代理还可以使用缓冲特性减少网络使用率。 | |||
| 反向代理 | 方向典型用途是将 防火墙后面的服务器提供给Internet用户访问。 | ||
| 反向代理还可以为后端的多台服务器提供负载平衡，或为后端较慢的服务器提供缓冲服务。 | |||
| 反向代理还可以启用高级URL策略和管理技术，从而使处于不同web服务器系统的web页面同时存在于同一个URL空间下。 | |||
| 安全性 | |||
| 正向代理 | 正向代理允许客户端通过它访问任意网站并且隐藏客户端自身，因此你必须采取安全措施以确保仅为经过授权的客户端提供服务。 | ||
| 方向代理 | 反向代理对外都是透明的，访问者并不知道自己访问的是一个代理 | ||
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