The HTTP Proxy Server:

• Connects requests through the HTTP protocol.

• Typically operates on ports 80, 3128, or 8080 of the proxy server.

The HTTPS Proxy Server:

• Connects requests through the HTTPS protocol.

• Uses port 443 and supports X.509 digital authentication.

The SOCKS Proxy Server:

• Connects requests through the SOCKS protocol, making it faster than other application-layer proxies.

• Typically operates on port 1080 of the proxy server.

• Ideal for use in enterprise or campus networks that need to access the Internet through a firewall or proxy server.

Note: SOCKS proxy is not typically used by dial-up Internet users and just because a user can browse the web doesn't mean they can access the Internet through SOCKS. Common firewalls and proxy software support SOCKS. It's important to differentiate between the HTTP proxy commonly used when browsing the web and the SOCKS proxy.