What is a Proxy Server?
A proxy server is an intermediary server that sits between a client and a destination server, forwarding requests and responses on behalf of the client. Proxy servers can provide anonymity, caching, access control, and traffic filtering.
How Does Proxy Server Work?
There are two main types of proxy servers: forward proxies and reverse proxies. A forward proxy sits in front of clients, intercepting outgoing requests to the internet and can be used for content filtering, access control, and anonymity. A reverse proxy sits in front of web servers, receiving incoming requests from the internet and distributing them to backend servers for load balancing, SSL termination, and caching.
In web hosting, proxy servers play critical roles in infrastructure architecture. Reverse proxies like Nginx and HAProxy distribute traffic across multiple application servers, cache static content to reduce server load, and provide an additional security layer by hiding backend server details. Forward proxies are used in corporate environments to monitor and control internet access. Transparent proxies intercept traffic without requiring client configuration, commonly used by ISPs for caching and content filtering.