What is a Proxy Server And How Does a Proxy Server Work?

Chances are, you’ve seen several proxy server Ads or someone has recommended it as the ideal solution to enhancing online privacy. However, did you know that not all proxy servers are built for elevating privacy? And, even those used for privacy still vary based on the level of privacy you get.

So, how do you know which proxy server is right for you? Let’s take a closer look at proxy servers, from the basics to how they work, and more.

What is a Proxy Server?

A proxy server is an intermediary system that intercepts and handles computer network traffic in a certain way. It may control the flow of traffic, modify certain aspects of the traffic, or forward traffic to a target server. 

Mostly, you’ll hear many say that a proxy server sits between a client and a destination server. In this case, the client is either a web app or browser installed in your device. 

The destination server is simply a computer in a different location, hosting a website, internal resource, cloud application, or digital service you want to use.

So, the proxy server “stands in the middle” and decides what to do with the traffic moving between your device and the destination server. It decides based on the configurations or rules set by you or a proxy service provider. Here’s a deeper dive into the workings of a proxy server.

How Does a Proxy Server Work?

As highlighted, many know proxy servers as privacy tools or a way to access the internet anonymously. However, not all proxy servers serve this function. That’s why we’re focusing on how proxy servers work at a basic level. 

To try out different types of proxy servers, select from among the best proxy providers. Businesses seeking reliable proxy solutions can explore services like Proxy-store that offer various proxy types with different configurations to meet specific networking requirements. Each proxy server would come with certain rules or configurations that you can adjust. And, once you setup your device to connect to the proxy server, this is what happens: 

1. The client sends a request

Setting up your device to communicate with a proxy server involves changing browser, operating system, or application-specific proxy settings to ensure traffic is sent directly to the proxy server’s address.

Normally, when you access a resource within a private network or the internet, you connect directly to the server hosting the resource. But, when you adjust the network settings to reflect a proxy’s address, all your traffic is first sent to the proxy server’s address before it is forwarded to the target server or modified in a certain way. 

So, since you’ve set up your device to communicate with a proxy server, the browser or web app you use would send a request to the proxy server.

The nature of the request varies based on what resource you want to access or what the proxy server does. For instance, if you are submitting a form, the request contains the destination server’s address, HTTP headers, your IP address, and data. When the context changes, the request’s nature changes too. 

2. Proxy server intercepts the request

Once the request gets to the proxy server, the server must evaluate who is making the request. It checks which device, user, and IP address sent it to determine whether you are authorized to access it. If you are not allowed to access the proxy server, it will send back an error message. 

If you are an authorized party, the proxy proceeds to assess the nature of the request. Is your request sending data to a server? Is it a request to load a web page? Or, what?

Understanding the nature or type of request helps the proxy server determine whether it is meant to handle such requests. It also helps it decide what rules to apply or what to do with the request. 

3. The server decides what to do 

If the server is meant to handle the request sent from your device (the client), this is what it can do with the request: 

• Block or deny the request:

Even after passing the authentication test, the proxy server may still block your request if the request violates security rules or time-based access rules. 

For instance, if you are trying to access an internal resource out of work hours, your request may be blocked or denied. Alternatively, if the proxy determines that you are attempting to access a banned website, it will block your request. 

• Modify the request:

Some proxy servers are put in place to rewrite part of the request before forwarding it. It modifies the request to satisfy certain system requirements or enhance anonymity. 

For example, the proxy server may replace identifying information like IP address and headers to enhance privacy. This technique is fundamental for large-scale web scraping, where automated services like HasData use vast proxy pools to gather public data without having their IP addresses blocked.

• Forward the request: 

Some proxy servers simply forward the request, especially when there is a need to maintain internal logs or records of the requests made to a certain internal resource. 

At times, some proxies configured to forward requests may have the capabilities to modify part of the request, too. 

• Redirect the request:

Sometimes, rather than routing a request to the destination server, a proxy may be configured to redirect a request. In some setups, residential proxies are used to reroute traffic through real devices across different locations to reduce blocks. Why? In some setups, a residential proxy is used to reroute traffic through different geographic locations to avoid blocks or balance network loads.

The proxy server may be configured to route traffic based on geographic location, to balance request load, or upgrade a request from HTTP or HTTPs. So, if sending the request to the destination server does not satisfy the rules, the proxy server redirects the request somewhere else. 

• Serve content from cache:

Some proxy servers are deployed to cache data from various resources. If you are requesting data from the cached data pool, the proxy server would serve it directly from its cache, saving time and bandwidth. 

4. The server sends the final output to the client

The final output varies based on the actions of the proxy. If you were getting data from a caching proxy server, the data would be delivered instantly. If your request was blocked, the proxy server would send back a message to your device (client), explaining the reason.

Closing Words

And, that’s it! The basics of a proxy server, covering what it is all about and how it works. Remember, most of the proxy servers out there handle requests differently. Do your due diligence before leasing a server to avoid wasting money, time, and resources.