It is a proxy, also called a proxy server, is a program that functions in the role of a intermediary between a client and server on the internet. Without a proxy, a client would be able to make a request for every resource straight to the server, and the server would provide the resource directly for the client. While this is a simple method to understand and implement, the addition of proxies could provide advantages in the form of improved performance and privacy, security and many more. As a pass-through layer, a proxy acts as an additional security layer on the internet between servers and clients.




There is a general consensus that the mix of hardware for servers and the software used to set up proxy installations is often referred too as proxy servers. This article will be focusing on proxy servers that are typically considered to be software, and also when referring to web servers. We will discuss of the two primary types that are forward proxy and reverse proxy. reverse proxy. They each have their own usage situation, and is often not understood due to the similar terms.




This article will give you some understanding about what proxies are and what subtypes they are, and how they work in common configurations. After reading this article, it will be able to identify the scenarios where you could benefit from a proxy. You'll then choose the best option between forward and reverse proxy in every situation.



Understanding Forward Proxies



The forward proxy, also referred to as the open proxy is the agent of a customer who wants to make a request through the internet to a source server. In this instance, the whole attempt to send requests by the user will instead be forwarded by the forward-proxy. This forward proxy, acting on behalf of the client will review the request. The first process is to determine if the client is allowed to accept requests from this particular forward proxy. Then, it decides to deny a request or forward it to its original server. The client isn't allowed directly access to internet. It has access to only what forward proxy permits it to connect to.




A popular use for forward proxy servers is to obtain more privacy or protection online. A forward proxy is able to access the internet lieu of a client, and as such, it may make use of an IP address that is different from the initial IP address.




Depending on how it's been set up the forward proxy will provide a variety of functions depending on how it is configured and lets you:




Avoid tracking ads.


Circumvent surveillance.


Find restrictions based on the location you are in.




Forward proxies are also utilized for security systems which are centralised and have permission-based access, such as in a workplace. All internet traffic can pass via the open forward proxy. administrators can allow just a few users online access using an common firewall. Instead of establishing firewalls at the layer of clients that could include a variety of computers with different settings and users A firewall can be placed at an intermediate layer of forward proxy.




It is vital to note that forward proxies must be manually set up to be used, however reverse proxies be ignored by users. Based on the fact that the IP address of a user is transmitted to the server from which it originated by the forward proxy privacy and anonymity could be granted, or left unnoticed.




There are a myriad of possibilities to explore for forward proxy options:




Apache: A popular open-source web server that provides forward proxy features.


Nginx is a popular open-source web server with forward proxy functions.


Squid is an open-source forward proxy which makes use of the HTTP protocol. It isn't an entire web server application. We have a instructions on setting up Squid proxy to connect privately in Ubuntu 20.04.


Dante Forward Proxy that utilizes the SOCKS protocol instead of HTTP which makes it better to handle peer-to-peer traffic. It is also possible to examine how you can setup the Dante proxy to connect privately in Ubuntu 20.04



Understanding Reverse Proxies



A reverse proxy serves as a webserver, which takes care of requests from clients on its behalf. The web server can serve as a single server, or multiple servers. In addition, it could be used in the role of an application server such as Gunicorn. In either of these scenarios the request comes from a customer via the internet. Typically, the request is directed directly to the web server which is the one that has the resources the user needs. A reverse proxy acts as an intermediary and shields it from any direct contact with the open internet.




From the perspective of the user, working with reverse proxy is not distinct from communicating with your website server direct. It's functionally identical and the user doesn't see the difference. The client makes an request for a resource, which is followed by receiving it with no additional configuration needed by the user.




Reverse proxies offer features like:




Security centralized for web servers.


Directing traffic in accordance with rules you decide to define.


Additional features to cache data.




Although centralized security is a benefit of both reverse and forward proxy servers. However, reverse proxy services provide this benefit to the web server layer, but not to the client layer. Instead of maintaining firewalls on the server level which could contain several servers that have different configurations, the majority of the firewall security can be centered at the reverse proxy layer. Additionally, getting rid of the responsibility of communicating with a firewall and interacting with clients who request information from web servers allows them to focus on serving the resources.




If multiple servers are operating behind a reverse proxy, the reverse proxy takes care of the way requests are routed to the server. There may be several web servers offering the same service, all offering different kinds of resources, or a combination of the two. They may use the HTTP protocol for a traditional web server, however they could also incorporate applications server protocols like FastCGI. You can set up reverse proxy servers to direct clients to specific servers based on the resource they request or to adhere to specific rules for traffic volume.




Reverse proxies can also benefit from their positioning over web servers, by providing the ability to cache data. Massive static resources can be set up using caching rules to prevent from hitting web servers with every request. Certain options allowing users to deliver static files directly without connecting to a web server even once. Additionally, reverse proxy is able to handle compression of these files.




The well-known Nginx website server a highly popular reverse proxy solution. While Apache is also a reverse proxy service, it is not a reverse proxy solution. Apache web server does have a reverse proxy functionality as an added option for Apache and Nginx was originally designed for and specifically focused on reverse proxy functions.



Differentiating Forward Proxy and reverse Proxy Use Differentiating Forward Proxy and Reverse Proxy Utilization



Since "forward" along with "reverse" are associated with the notion of directionality, and false distinctions between "incoming" as well as "outgoing" traffic These labels are prone to confusion since both kinds of proxy handle responses and requests. In addition, the most effective method to distinguish between reverse and forward proxy is to look at the specifications of the application that you're developing.




Reverse proxy is a crucial feature when you are designing a solution to host websites on the internet. They act as your web server for any interaction on the internet.




A forward proxy is beneficial when used in front of customers for your own use or in a work environment. They act as your client's proxy for any interaction on the internet.




The use case-based differentiation as opposed to focusing only on standard naming conventions makes it easier to avoid confusion.



Conclusion



The article explained the meaning of a proxy with the two main types being the forward proxy and reverse proxy. Practical scenarios for use and a review of the most beneficial features were used to differentiate between forward proxies and reverse proxies. If you're looking to know more about the possibilities of proxies, you can read our guide on how to set up Nginx as an reverse proxy and an internet server with Apache using the Ubuntu 20.04 server.



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