A proxy, also known as a proxy also referred to a proxy server, is a software that functions as mediator between client and server on the internet. Without a proxy, a client will send a request directly to the server and it would serve the requested resource directly to the user. Although this is a simple process to comprehend and implement using proxy servers, it could bring benefits in the form of improved performance and privacy, security and more. In addition to providing a layer of pass-through proxy, it acts as a guardian for the internet, separating servers and users.




In general, the bundle of server hardware that is installed with proxy software is commonly called proxy servers. In this post, we'll concentrate on proxy servers that are typically classified as software as well as in the context of web servers. This article will give a detailed breakdown of the two main types of proxies: the forward proxy and the reverse proxy. Each has its own application, and is frequently confused because of a similar name convention.




This article will give you an understanding of types of proxy services and what their subtypes are as well as their significance in standard setups. Through this article, you'll be able to understand what circumstances that a good proxy is beneficial and select the best option between reverse and forward proxy depending on the circumstance.



Understanding Forward Proxies



A forward proxy also called an open proxy serves as an intermediary between a client that is trying to transmit a request over the internet to a source server. In this scenario, every request sent by the user will be sent straight through the forward proxy. A forward proxy in the client's stead, will scrutinize the request. It will first determine if the client is permitted be able to accept requests through this particular forward proxy. It will then reject any request or forward it to the original server. The client does not have direct access to the internet. It has access to only the information that forward proxy grants the client access.




A very frequent uses for forward proxies is to improve privacy or security when using the internet. Forward proxy makes use of the internet as the client and in this process it can use an alternative IP address to the original IP address of the client.




Based on the way it is configured based on the way it's configured forward proxy could provide various features based upon the configuration, which allows users to:




Stay clear of tracking ads.


Circumvent surveillance.


You can determine limitations based on your geographic location.




Forward proxies are also used in systems that offer central security as well as access based on permissions, such as in an office. The entire internet can be passed via an open forward proxy, an administrator is able to restrict access to only certain users to the internet, which is protected by a standard firewall. In lieu of having firewalls on the client layer, which could include multiple machines with different configurations and users it is possible to have a firewall at the front proxy layer.




Take note the forward proxy setting should be manually configured for use, but reverse proxies are likely to be ignored by the client. Depending on whether an IP address belonging to the user is transmitted to the server where it originated via the forward proxy, privacy and security can be granted or kept secret.




There are many choices to be considered for forward proxy options:




Apache is a well-known open-source web server that provides forward proxy functions.


Nginx: Another widely used open-source server used for web hosting that has forward proxy features.


Squid: An open-source forward proxy that utilizes the HTTP protocol. It's not the entire web server. Read our guide on how to install Squid proxy for private connections in Ubuntu 20.04.


Dante is a forward-looking proxy, which utilizes the SOCKS protocol instead of HTTP to make it better suited for cases like peer-to-peer connections. You may also want to examine how you can configure Dante proxy to allow connection to private networks in Ubuntu 20.04



Understanding Reverse Proxies



A reverse proxy is the web server, which takes care of the incoming requests of customers on behalf of. The web server can be a single, or a number of servers. It may additionally be an app server, such as Gunicorn. In any of these situations the request for an application is received through the internet. In most cases the request will be sent directly to the web server, which will provide the information the user is seeking. A reverse proxy acts as an intermediary and isolates your website server from communication with the internet's open.




From the viewpoint of the user's viewpoint the procedure of using reverse proxy isn't different from using a Web server to communicate in direct communication. It's the same thing, and the client cannot discern the difference. The client makes a request for a resource, which is followed by its receipt without the need for any additional configuration needed for the end-user.




Reverse proxies offer features such as:




A centralized layer of security to protect the server.


The direction of traffic coming in is based on rules you decide to define.


New caching functionality has been added.




While centralized security is a benefit of both forward and reverse proxy, reverse proxies do this for the web server layer, but not the client layer. Instead of focusing on the upkeep of firewalls on the layer of web servers that could contain multiple servers with different configurations, the majority of firewall security is targeted at the reverse proxy layer. Also, the removal of the responsibility of interfacing with firewalls as well as communicating with requests from clients far from web servers enables them to focus on meeting the needs of their customers.




If there are multiple servers that are connected via reverse proxy reverse proxy is responsible for directing what requests go to which servers. There may be several web servers providing identical content, but providing different services, or a mix of the two. They could be running the HTTP protocol, which is a typical web server, however they could incorporate other protocols for application servers like FastCGI. You can also set up reverse proxy settings to direct visitors to specific server depending on the requested resource or to adhere to certain guidelines regarding the load of traffic.




Reverse proxies can also take advantage of their location on top of web servers by giving them the ability to store information. Massive static resources can be configured using caching rules to prevent the web server from being hit with every request. Some solutions providing the option to serve static files directly without connecting to servers on the internet in any manner. Additionally the reverse proxy is able to handle compressing these assets.




The well-known Nginx web server is also used as a well-known reverse proxy option. Although there is a similar feature that is available in Apache web server, it has reverse proxy capabilities as an added feature that is available for Apache however Nginx was originally designed for and is specifically designed for reverse proxy functions.



Distinguishing Forward and Reverse Proxy Use Cases



Because "forward" along with "reverse" are associated with directionality and misleading comparisons with "incoming" as well as "outgoing" traffic The labels can be confusing since both types of proxy systems process requests as well as responses. Better yet, the best method of separating between a forward and reverse proxy is to look at the specifications of the application you're developing.




Reverse proxy is beneficial when you are developing an application that can serve web applications on the internet. They act as your web servers when you interact with the internet.




Forward proxy can be useful when placed in front of customers for your personal use or in a work setting. They represent your client traffic when they interact via the internet.




The use case-based differentiation instead of focusing solely on standard naming conventions could help in avoiding confusion.



Conclusion



This article clarified what aproxy is, and compared it to the two most common kinds: the forward proxy and the reverse proxy. Practical applications as well as a review of the benefits were used to identify forward proxies and reverse proxy. If you're looking to know more about the implementation of proxy servers, you can check out our tutorial on how you can set up Nginx as reverse proxy and web server proxy for Apache on an Ubuntu 20.04 Server.



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