Differences Between 3 Types Of Proxy Servers: Normal, Transparent And Reverse Proxy

What is a Proxy Server?

A Proxy server is an intermediary machine, between a client and the
actual server, which is used to filter or cache requests made by the
client.

This article is focused on the Different Caching Web Proxies.

Normal (Regular/Caching) Proxy:

A regular caching proxy server is a server which listens on a separate
port (e.g. 3128) and the clients (browsers) are configured to send
requests for connectivity to that port. So the proxy server receives the
request, fetches the content and stores a copy for future use. So next
time when another client requests for the same webpage the proxy server
just replies to the request with the content in its cache thus improving
the overall request-reply speed.

Transparent Proxy:

A transparent proxy server is also a caching server but the server is
configured in such a way that it eliminates the client side (browser
side) configuration. Typically the proxy server resides on the gateway
and intercepts the WWW requests (port 80, 443 etc.) from the clients and
fetches the content for the first time and subsequently replies from
its local cache. The name Transparent is due to the fact that the client
doesn't know that there is a proxy server which mediates their
requests. Transparent proxy servers are mostly used in big corporate
organizations where the client side configuration is not easy (due to
the number of clients). This type of server is also used in ISP's to
reduce the load on the bandwidth usage.

Reverse Proxy:

A reverse proxy is totally different in its usage because it is used for
the benefit of the web server rather than its clients. Basically a
reverse proxy is on the web server end which will cache all the static
answers from the web server and reply to the clients from its cache to
reduce the load on the web server. This type of setup is also known as
Web Server Acceleration.