挂几张图，把 proxy，forward proxy，reverse proxy 的概念呈现出来。
Types of proxy servers
A proxy server may reside on the user's local computer, or at various points between the user's computer and destination servers on the Internet.
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gateway or sometimes a tunneling proxy
A proxy server that passes unmodified requests and responses. - forward proxy
An Internet-facing proxy used to retrieve from a wide range of sources (in most cases anywhere on the Internet). - reverse proxy
An internal-facing proxy used as a front-end to control and protect access to a server on a private network. A reverse proxy commonly also performs tasks such as load-balancing, authentication, decryption or caching.
Forward Proxy
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常见的就是办公室代理上互联网的 Server。
forward proxy
Reverse Proxy
reverse proxy
reverse proxy
Open Proxy
open proxy
privacy in danger
