A proxy is can also be referred to as an application called a proxy server that acts as a mediator between a client and server on the internet. Without the need for proxy servers, a user could submit a request to resources directly to a server and servers would provide requests directly for the resource requested by the client. It is an easy procedure to understand and utilize, the addition of proxy servers could bring benefits such as enhanced performance and privacy, security and many more. As an additional pass-through layer, proxies serve as a security barrier on the internet between clients and servers.




Generally speaking, the bundled package of server hardware with the software for proxy installation is typically referred as proxy servers. This article will concentrate on proxy servers which are usually regarded as software as being used in conjunction with web servers. The article will offer details of the two main types of proxy servers, which include a forward proxy and reverse proxy. reverse proxy. Each has its own usage scenario, which is often misunderstood due to the identical namesake convention.




This article will provide you with an idea of the what proxy services and their subtypes are, and how they are useful for common setups. If you've read this article, you'll be able to recognize situations where it's advantageous to use proxy services and make the right choice between reverse proxy and forward proxy, in any situation.



Understanding Forward Proxies



The forward proxy also referred to as an open proxy serves as the representative of the client trying to make an internet-based request to the server that made it. In this case any attempts to send requests from the user will instead be sent directly to the forward proxy. In this scenario the forward proxy acting on behalf of the client will examine the request. It first will determine if the client can make requests via this specific forward proxy. It will then either refuse requests or redirect it to the server that originally made the request. The client isn't able to have an internet connection directly. It can access only what forward proxy allows it to connect to.




The primary reason people use forward proxies is to improve privacy or security on the internet. A forward proxy uses the internet in lieu of a client on its own, and during this manner, it may utilize an alternate IP address in place of the primary IP address that is used by the client.




Depending on how it's been setup, forward proxy may offer a variety of features and permit you to:




Stay clear of tracking ads.


Circumvent surveillance.


Determine restrictions based on location.




Forward proxies may also be used in systems that provide centralized security and access that is based on permissions, such as in workplaces. If all internet traffic is routed through an open front proxy, the administrator can allow only a few clients access to the internet using an common firewall. Instead of maintaining firewalls at the client layer that could include a variety of machines with different settings and users, there is a way to put a firewall set up at the front proxy layer.




Take note that forward proxies need to be set up manually to allow the use of these proxies, whereas reverse proxies can be omitted by clients. Based on the type of IP address of a user is sent to the source server via forward proxy privacy and security may be granted or left transparent.




There are many options to consider for forward proxy options:




Apache is an incredibly well-known open source web server that provides forward proxy features.


Nginx is another widely-used open-source webserver that includes forward proxy functions.


Squid: A free and Open Source Forward Proxy that utilizes the HTTP protocol. This option doesn't include the entire web server application. You can read our tutorial on how to install Squid proxy to allow private connections on Ubuntu 20.04.


Dante: A forward proxy that operates on the SOCKS protocol instead of HTTP in order to be better suitable for situations such as peer-to-peer connections. It is also possible to learn how to create a Dante proxy that allows private connections in Ubuntu 20.04



Understanding Reverse Proxies



A reverse proxy acts as an intermediary for a web server that handles any requests that come in from clients on behalf. The web server can comprise an individual server or a number of servers. Furthermore, it could serve as an app server such as Gunicorn. In any of these scenarios, a request would be made by a user through the web at large. The majority of the time the request is made directly to the web server that hosts the information the client is seeking. Reverse proxy serves as a middleman to isolate Web servers and prevent direct contact with the public internet.




From a consumer's point the client's point of view using reverse proxy is not anything different than working with a Web server in direct contact. It's basically the same, but the client can't tell the distinction. The client requests the resource and it gets it, without any additional configuration needed from the user.




Reverse proxies provide features like:




A central layer of security to protect the server.


Controlling traffic that is inbound according to rules you can configure.


New functionality added for caching.




Although central security is a benefit for both reverse and forward proxy servers, reverse proxy servers provide this feature to that layer on the webserver and not the client layer. Instead of coordinating firewalls on the server level, which could comprise multiple servers with different configurations, the bulk of security for firewalls is centered upon the reverse proxy. Furthermore, the elimination of the responsibility to interact with firewalls and interfacing with client requests via web servers allows firewalls to focus on providing the necessary resources.




If there are multiple servers connected to a reverse proxy, the reverse proxy also is responsible for directing which requests are directed to which server. There may be multiple web servers providing the same content, providing different types of services or a combination of both. These servers could be running the HTTP protocol exactly the same way as the traditional web server. However, they could also be able to use application server protocols such as FastCGI. It is possible to set up a reverse proxy to send users to a specific server based on the service they require, or to adhere to certain rules for traffic load.




Reverse proxies may also benefit from their position before web servers by providing the capability to store data. Large static assets can be set up using caching rules to prevent having to contact web servers for every request. There are some solutions even allowing users to serve static files directly without having to contact the server once. In addition the reverse proxy can handle compression on these resources.




The popular Nginx web server also functions as a powerful reverse proxy solution. However, Apache has a reverse proxy option, it is a reverse proxy solution. Apache web server also comes outfitted with a reverse proxy feature as an added option for Apache as opposed to Nginx was initially designed for and is focused on reverse proxy capabilities.



Distinguishing Forward Proxy from Reverse Proxy Use Cases



Since "forward" or "reverse" have connotations of directionality as well as inaccurate comparisons with "incoming" as well as "outgoing" traffic These labels can be confusing since both types of proxies handle the process of responding to requests. The best method to differentiate between reverse and forward proxies is to examine the needs of the app you're working on.




Reverse proxy is an effective tool when you're designing a solution to deliver applications on the web via the internet. They act as your web servers when you connect to the internet.




A forward proxy can be helpful when it is displayed in front of clients for personal use and in professional setting. They are a representation of your client's traffic for any internet-based interaction.




The practice of separating by use case, instead of using the same names will help in avoiding confusion.



Conclusion



This article clarifies the meaning of a proxy, with two types being the forward proxy and reverse proxy. Practical scenarios for application and an examination of the beneficial attributes were used to determine forward proxies as well as reverse proxies. If you'd like to explore the implementation of proxies then you should read our guide on how to configure Nginx as an internet server and reverse proxy to Apache on an Ubuntu 20.04 server.



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