A proxy or proxy server. It is software acting as an intermediary client and server over the internet. Without proxy servers, a user could send a request for resources directly to a server and it would deliver the resource directly back towards the customer. Although this method is easy to comprehend and implement, but the addition of proxy servers can offer benefits such as increased performance and privacy, security and more. As an additional layer of pass-through the proxy functions as a guardian for the internet, separating clients from servers.

In general, the combined system of server hardware that is paired with installed proxy software is also commonly described as a proxy server. This article will discuss proxy servers that are typically described as software and specifically in relation to web servers. We will discuss of the two main types of proxies, the other being a forward proxy and the reverse. reverse proxy. Each type has its own application and can be confusing due to the resemblance of namesake convention.

This article will provide you with an idea of the different subtypes and proxies in terms of their importance for the common setups. If you've read in this post, you'll be able discern situations in which the use of proxy servers is beneficial, and you can then select the most appropriate option between reverse proxy and forward proxy, based on the circumstances.

Understanding Forward Proxies

Forward proxy, also known in the context of open proxy. An open proxy acts as the representative of a client who wishes to make an internet-based request to an the server that made it. In this case, all attempts to send requests from the client will instead be sent to forward proxy. Forward proxy in place of the client will review the request. First, it will determine if this client is authorized to receive requests from this particular forward proxy. Then, it will deny any request or forward it to the server that originated it. The client is not able to have direct access to the internet It can only access what forward proxy permits it to connect to.

The most common reason for using forward proxy servers is increased privacy or anonymity online. A forward proxy accesses the internet as clients and, in this manner it may utilize an IP address that is different from the IP of the user.

Depending on how it's been configured the forward proxy will give you a range of options as well as the ability to:

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  Beware of Ad-trackers.
  
  
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  Circumvent surveillance.
  
  
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  Find restrictions based on your area.
  
  

Forward proxies can also be utilized in systems that provide central security and permission-based access, like in workplaces. All internet traffic can pass through a forward proxy and administrators are in a position to grant only specific clients access to the internet using a common firewall. Instead of having firewalls in place for the client layer, which could include multiple machines with different settings, environment, a firewall can be installed in an forward proxy layer.

It is important to remember the forward proxy configurations have to be set up manually to permit them to be used for use in reverse proxies, whereas forward proxies are able to not be detected by users. Based on the IP address of a user is passed on to the server from which it originated through the forward proxy privacy and security can be granted or kept in the dark.

There are many alternatives to take into consideration when considering forward proxy alternatives:

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  Apache A well-known open source web server with forward proxy functions.
  
  
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  Nginx A renowned open-source web hosting server with forward proxy capabilities.
  
  
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  Squid: A no-cost forward proxy that runs on it's HTTP protocol. It's not the full Web Server System. It is possible to refer to our article on the most efficient method to set up Squid proxy to handle connection to private networks in Ubuntu 20.04.
  
  
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  Dante Forward proxy that makes use of the SOCKS protocol instead of HTTP and HTTP, which makes it better suited for scenarios like peer-to-peer traffic. You can also learn how to configure Dante proxy to allow connection to private networks in Ubuntu 20.04
  
  

Understanding Reverse Proxies

Reverse proxy functions as an intermediary between web servers, and takes care of requests from clients for the web server. The web server can serve as a one server or as a series of servers. In addition, it could serve as an application server such as Gunicorn. In all cases, the request for an application comes by a user on the internet. Typically, the request will directly go to the server that hosts the information that the user is searching for. The reverse proxy serves as an intermediary in order to block your server from interaction via the web's public.

From the perspective of a user's view, interacting with reverse proxy doesn't differ from interacting with your webserver directly. It's functionally identical, but the user can't discern the distinction. Client requests an item and is given it, without requiring any additional configuration from the user.

Reverse proxy providers provide features like:

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  The web server is secured centrally.
  
  
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  Sending traffic to be directed according to rules you set.
  
  
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  The caching functionality was added to the application.
  
  

While central security is a benefit of both reverse and forward proxy, reverse proxies provide this only for the web server layer but not the client layer. instead of the maintenance of firewalls for Web server layers, which could comprise multiple servers that have different configurations, the majority in firewall protection is aimed towards the reverse proxy layer. Additionally, removing the burden of interacting with firewalls and responding to requests from clients off of web servers lets them focus on serving resources.

If there are multiple servers with a reverse-proxy, the reverse proxy is also accountable for deciding which requests go at which server. There could be multiple web servers running within the server each serving different types of resources or a combination of both. These servers may use the HTTP protocol similar to a conventional web server. They could also incorporate protocols for application servers like FastCGI. You can also set up a reverse proxy to route the clients towards specific servers based on the service requested, or to observe certain guidelines regarding traffic load.

Reverse proxies are also able to make use of their location over web servers with the help of caching. The large static files can be configured with caching rules to avoid the web server from being hit with each request. Some solutions even allowing users to upload static files directly without connecting with the server. Furthermore, the reverse proxy can handle the compression of these assets.

The popular Nginx web server has become an extremely popular reverse proxy option. However, it's not a reverse proxy, the Apache web server also comes equipped with reverse proxy feature as an additional feature that is available for Apache however Nginx was designed initially for and specifically focused on the reverse proxy function.

Distinguishing Forward Proxy from Reverse Proxy Use Cases

Since "forward" along with "reverse" are associated with a sense of directionality and also misleading comparisons with "incoming" as well as "outgoing" traffic. These labels can be confusing, because both types of proxies can be used to manage requests and responses. Another method of separating between forward and reverse proxy servers is to look at the specifications of the software you're developing.

Reverse proxy is a useful tool when you're developing a solution to serve web applications on the internet. They act as your servers when you interact with the Internet.

Forward proxy can be useful to use if you're working with clients in front to use for personal purposes or in a professional setting. They are a representation of your traffic when you are on the internet.

A distinction based on usage case instead of looking at the common naming conventions can assist you in getting rid of confusion.

Conclusion

The article explained what a proxy is along with two types being the reverse proxy and forward proxy. Practical examples of use as well as a discussion of most effective features were utilized to distinguish forward proxies and reverse proxies. If you're looking to learn how to set up proxies, we recommend you read our guide on how to set up Nginx as an internet server and reverse proxy on Apache using an Ubuntu 20.04 server.

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