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The term "proxy" refers to a proxy, also called a proxy server. It is program acting as an intermediary a client and server via the internet. Without the proxy, a user would send a request for resources directly to a server, and it would deliver the resource directly back to the user. While this is a simple method to comprehend and implement, however, adding proxy servers can offer benefits like increased performance, privacy, security, and more. In addition to providing pass-through the proxy functions as a security guardian of the internet, separating clients from servers.

Generally speaking, the combined system of server hardware and the software for proxy installation is frequently described as a proxy server. This article will discuss proxy servers that are typically described as software as well as in relation to web servers. There will be a discussion of the two main kinds of proxies. One being forward proxy and the other being a forward proxy and reverse proxy. reverse proxy. Each kind of proxy has its own purpose and can be confusing because of the similar namesake convention.

This article will provide you with an idea of the types of proxies and subtypes, as well as their value for common setups. If you've read in this post, you'll be able understand the situations when using proxies can be advantageous, and then choose the best choice between reverse proxy and forward proxy depending on the circumstance.

Understanding Forward Proxies

Forward proxy also known as an open proxy is the agent of a user who would like to send an internet request to an the server which originated it. In this scenario any attempts to send requests made by the client will instead be sent through the forward proxy. Forward proxy in lieu of the client, will review the request. The first step is to verify if the client is allowed to receive requests from this specific forward proxy. It will then deny any request or forward it to the origin server. The client doesn't have a an internet connection directly; it can only reach what forward proxy permits it to access.

The primary reason for people for using forward proxy servers is the increased privacy or anonymity online. Forward proxy's access to the internet as clients and in this way it may use an IP address different from the original IP address of the user.

Depending on the way it's configured the forward proxy will provide a variety of functions in addition to the ability to:

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  Beware of ads-trackers.
  
  
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  Circumvent surveillance.
  
  
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  Find restrictions based on the location you are in.
  
  

Forward proxies also are used in systems that provide central security and permission-based access, like in a workplace. If all internet traffic passes through a forward proxy Administrators are capable of allowing only certain clients access to the internet via a common firewall. Instead of having firewalls to protect the client layer which could include multiple machines with different settings, environment the firewall is put in an forward proxy layer.

It is crucial to keep in mind the forward proxy configurations must be manually setup to allow the use of these proxy servers for use in reverse proxies, whereas forward proxy settings are not able to be detected by users. Based on whether or not the IP address of the user is sent to the server that originated it through the forward proxy, the privacy and security can be granted or not.

There are a variety of options to consider for forward proxy choices:

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  Apache A well-known open source web server that has forward proxy features.
  
  
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  Nginx A renowned open-source server for web hosting with forward proxy functions.
  
  
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  Squid: A free forward proxy that uses an HTTP protocol. It's not the full webserver system. We recommend our guide on the best method of configuring Squid proxy for 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 to scenarios like peer-to -peer traffic. You can also check out how to set up Dante proxy to allow connection to private networks in Ubuntu 20.04
  
  

Understanding Reverse Proxies

Reverse proxy acts as an intermediary for web servers, and takes care of requests from clients for the web server. The web server may serve as a single server or as a series of servers. It could also function as an app server, such as Gunicorn. In any case an application request comes from a user via the internet. Most of the time, the request will go directly to the server that hosts the information that the user is looking for. The reverse proxy acts as a middleman to protect your website server from communication via the web's public.

From a consumer's point perspective, using reverse proxy isn't different from communicating with the web server directly. It's basically the same but the client 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 server on the internet is protected centrally.
  
  
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  Directing traffic according to rules you set.
  
  
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  The caching functionality was added to the application.
  
  

While centralized security is a benefit of both reverse and forward proxy, reverse proxies do this only for just the Web server layer and not to the client layer. instead of maintaining security firewalls in Web server layers that may contain multiple servers with various configurations, the bulk in firewall protection is aimed towards the reverse proxy layer. Additionally, removing the burden of interfacing with firewalls and interfacing with clients' requests 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 what requests are routed to which server. There could be multiple web servers that are running from the same host, each serving various kinds of resources, or a mix of the two. These servers could use the HTTP protocol similar to a conventional web server. They may also use applications server protocols such as FastCGI. You can also configure reverse proxy servers to direct the clients towards specific servers depending on the service requested, or to observe certain guidelines regarding traffic load.

Reverse proxies can also take advantage of their placement on top of web servers through the capability of caching. Large static assets can be configured with caching rules to avoid the web server from being hit with each request. Some solutions even allowing you to provide static files without having to connect directly to the website server. Furthermore, the reverse proxy can manage compression of these files.

The well-known Nginx web server is a wildly popular reverse proxy solution. Although the Apache web server is also available with the reverse proxy option as an added feature which is accessible for Apache however Nginx was originally designed to and specifically designed for reverse proxy functions.

Distinguishing Forward Proxy from Reverse Proxy Use Cases

Because "forward" along with "reverse" are both associated with a sense of directionality as well as false comparisons with "incoming" and "outgoing" traffic These labels can be confusing, because both types of proxies are able to handle requests as well as responses. An alternative method to differentiate between forward and reverse proxy servers would be to look at the needs of the application you're creating.

Reverse proxy is a useful tool when you're designing a solution to host websites on the internet. They are your web servers in any interaction with the Internet.

Forward proxy can be useful to use when you are facing clients for personal usage, or even in a professional setting. They can be used to represent the traffic of your clients when you interact with the internet.

A distinction based on usage rather than looking at the common names can help in avoiding confusion.

Conclusion

The article clarified what a proxy was and the two kinds of proxy being the reverse proxy and forward proxy. Practical examples of use and a discussion of the most beneficial features was used to differentiate forward proxies from reverse. If you'd like to explore how to implement proxies we recommend you read our guide on how to set up Nginx as an internet server and reverse proxy for Apache using the Ubuntu 20.04 server.

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