A proxy server is a middleman computer that sits between your device and the site you're requesting. Your request goes to the proxy first, the proxy forwards it under its own address, the site's response comes back to the proxy, and the proxy passes it on to you - so the site only ever sees the proxy's address, never yours.
"Proxy" gets used as shorthand for "something that hides my address," which is true but skips the part that actually explains it. A proxy is a real computer doing a real job in the middle of the connection, and once you see that handoff, the different types and their trade-offs stop being a list to memorize and start making sense on their own.
This page is the mechanics: what happens to a request on its way through a proxy, the handful of types built for different jobs, and how to tell whether you're behind one right now.
How Does the Request Actually Flow?
Every step is a normal network request - nothing about a proxy requires special hardware or a special protocol on the site's end. It works because the proxy is willing to make the request on your behalf and hand you back what it gets.
Two hops each way. The site only ever addresses its reply to the proxy.
Forward Proxy or Reverse Proxy - Which One Is This?
Most explanations only describe half of what "proxy" covers. A forward proxy sits in front of the client - it's the type this whole page has been describing, standing between you and the sites you visit, and it's what people mean when they say "use a proxy" for browsing, scraping or automation.
A reverse proxy sits in front of the server instead, and you are usually using one without configuring anything. Large sites put a reverse proxy in front of their own servers to distribute incoming traffic, cache common responses, and hide which specific server actually handled the request. From your side, it looks like an ordinary website - the proxying is happening on their end, not yours.
What Are the Main Types of Forward Proxies?
| Type | What It's For | Trade-off |
|---|---|---|
| HTTP/HTTPS proxy | Web traffic, browser configuration | Simple, but web-only |
| SOCKS5 proxy | Any kind of traffic, not just web requests | More flexible, no encryption of its own |
| Datacenter proxy | Fast, cheap, high-volume use | Easy for a site to recognize as hosting infrastructure |
| Residential proxy | Traffic that needs to look like an ordinary home connection | Slower and considerably more expensive |
| Transparent proxy | Set by a network, not chosen by the user | Doesn't hide your address at all, only filters or logs it |
A transparent proxy is worth knowing about on its own. Schools, offices and some ISPs route traffic through one without any setup on your device, and its job is filtering or monitoring, not privacy - it forwards your real address along with the request rather than replacing it.
Does a Proxy Encrypt My Traffic?
No, not on its own. If the site you're loading uses HTTPS, that encryption comes from the site's own certificate and covers the connection between your browser and the site directly - a proxy in the middle is carrying traffic it cannot read either way. What a proxy adds no protection to is anything that isn't HTTPS, and the initial request that tells the proxy which site you want, which travels to the proxy itself in plain text. For the fuller comparison against the tool people usually weigh a proxy against, VPN vs proxy: which one do you actually need covers that decision directly.
How Do You Actually Set One Up?
- Per app. Most browsers and many tools have a proxy field in their network settings - an address and a port, entered once.
- System-wide. Windows, macOS, Android and Linux all offer a device-level proxy setting, though it works as a request rather than a rule - an app only honors it if it checks for one.
- In code. Scripts and scraping tools usually take a proxy address as a configuration value or an environment variable, routing that one process without touching anything else on the machine.
How Can You Tell If You're Behind One Right Now?
Your own network, a workplace, or a browser extension can all put you behind a proxy without an obvious sign of it happening. The IP Lookup tool shows the address and provider a site would actually see for you, and the Proxy Check tool reads whether that address sits in a catalogued proxy or hosting range - the same signal a site checks before deciding whether to show you a CAPTCHA.
What Are Proxies Actually Used For?
- Web scraping and automation. A pool of addresses in rotation avoids one address hitting a site's rate limit.
- Ad verification and price monitoring. Seeing a page the way a visitor in a different location or on a different type of connection would see it.
- Workplace content filtering. Organizations route staff traffic through a proxy to block categories of sites or log usage.
- Caching and load distribution. On the reverse-proxy side, serving repeated requests from a cache and spreading traffic across multiple backend servers.
Frequently Asked Questions
Is a proxy server the same as a VPN?
No. A proxy redirects one app's traffic and adds no encryption of its own, while a VPN encrypts and routes everything the device sends. They both change the address a site sees, but that's the one point they have in common.
What's the difference between a forward proxy and a reverse proxy?
A forward proxy sits in front of the client and represents you to the sites you visit. A reverse proxy sits in front of a server and represents the server to everyone visiting it, usually for load balancing or caching, with no setup on the visitor's side.
Can a website tell I'm using a proxy?
Often, yes. Datacenter proxy addresses are cataloged as hosting infrastructure and are easy to flag. Residential proxy addresses look like an ordinary home connection and are far harder to identify, which is the main reason they cost more.
Does a proxy slow down my connection?
Usually less than a VPN does, since there's no encryption overhead, but any extra hop adds some delay. A proxy that's far away, overloaded, or a slower residential connection can still make a page feel slower to load.
Is it legal to use a proxy server?
The tool itself is legal in most places. What can cross a line is what it's used for - rotating addresses specifically to get around a site's rate limits or blocks can breach that site's own terms of service, regardless of which tool is doing the rotating.
What is a transparent proxy?
A proxy set by a network rather than chosen by the user, common on school, office and some ISP connections. It's built for filtering or monitoring, not privacy, and it forwards your real address along with the request instead of replacing it.
Final words. A proxy server is a straightforward idea once you follow the request instead of the marketing - a computer forwarding your traffic under its own address, nothing more automatic or more mysterious than that. Which type fits depends entirely on the job: web-only or anything, cheap and fast or hard to flag, one app or the whole network. You can see what your own connection is currently showing on the MyIPShow homepage.