Understanding Proxy Sites > 자유게시판

proxy or proxy is often referred to by the name of a proxy, software that acts as a mediator between a client and server via the internet. Without the use of a proxy, a user can send a request for a source directly through the server and the server would deliver an item directly for the requester. This method is simple to grasp and use however, the addition proxy servers can offer advantages in terms of better speed, privacy and security, and many more. Apart from offering a security layer the proxy also acts as a gatekeeper to the internet, separating clients and servers.




The package of server hardware along with an installed software proxy is also often referred as a proxy server. For this post, we will focus on proxies traditionally classified as software, and in the context of web servers. You will get a breakdown of the two principal kinds of proxies. These are the forward proxy and reverse proxy. reverse proxy. Each type of proxy has its own unique usage scenario, which is often not understood due to the common names.




This article will provide you with some understanding about what proxies and subtypes are, and how they can be useful in a range of configurations. Through this article, you'll learn to recognize the situations where the use of proxies is advantageous, and then make the best option between reverse and forward proxy for any particular situation.



Understanding Forward Proxies



An forward proxy sometimes known as open proxy. An open proxy acts as an agent for an individual trying to make a request via the internet to a source server. In this case, every attempt to send requests made by the client will be handled by the forward proxy. The forward proxy, acting in the place of the client, will examine the request. It will first determine if the client has been granted permission to receive requests from this particular forward proxy. It will then either refuse requests or redirect it to the source server. It isn't able to direct connection directly to internet. It can only access what the forward proxy enables the forward proxy to connect.




The most common reason for using forward proxy is to provide more privacy or security while online. Forward proxy connects to internet as a client and during this manner, it connects an alternative IP address to the IP address of your client.




Based on the way it has been configured based on the way it was configured, forward proxy may provide a wide range of options which allow you to:




Beware of tracking ads.


Circumvent surveillance.


You can spot limitations based on your location.




Forward proxies can also be used in systems that give central security and access through permissions, like in a workplace. The entire internet can go by an open forward proxy, administrators are able to grant access to specific people to connect on the internet, which is then filtered by the standard firewall. Instead of having firewalls at the client layer, this can be utilized by a variety of computer systems with different settings and users A firewall can be found at this forward proxy layer.




Take note that forward proxy servers require manual setup for them to be used however reverse proxies won't be noticed by the user. Based on the fact that the IP address of a user is transmitted to the original server by forward proxy Privacy and anonymity could be granted or kept in the dark.




There are numerous possibilities to think about when considering forward proxy services.




Apache: A popular open-source webserver that provides forward proxy functions.


Nginx: Another well-known open source web server that has forward proxy capabilities.


Squid: An open source forward proxy that utilizes an HTTP protocol. It doesn't come with the whole web server. There is a step-bystep guide to setup Squid proxy for secure connections on Ubuntu 20.04.


Dante Forward proxy that uses the SOCKS protocol rather than HTTP and is better suited for cases like peer-to-peer traffic. It is also possible to look into how you can install a Dante proxy that allows private connections to Ubuntu 20.04



Understanding Reverse Proxies



Reverse proxy is an intermediary for a web server that handles the incoming requests of clients in its place. It can be used as a single server or as a set of servers. Additionally, it can include an application servers, such as Gunicorn. In any event, it's possible to receive a request from a customer through the internet at large. In the majority of cases, the request would be sent directly to the web server hosting the data the client wants. A reverse proxy works as an intermediary in order to block your server from communications with the internet's public.




From the point of perspective, which is also a user's viewpoint, interfacing using reverse proxy is not different from connecting to the server in its own. It's functionally the same as the web server, and the client is unable discern the distinction. The client is able to make a request for the resource and it is then given it, with no extra configuration required by the user.




Reverse proxies grant features like:




Security centralized to web server.


The direction of traffic that is incoming based on rules you can make.


Added functionality for caching.




While central security is an advantage of both reverse and forward proxy, reverse proxies perform this service to only the layer of web servers but not the client layer. instead of having firewalls installed on the layer of web servers that may contain multiple servers with various configurations, the bulk of firewall security is located on the reverse proxy layer. Additionally, getting rid of the necessity of connecting to a firewall and interacting with requests from clients that do not use web servers lets them focus on meeting the requirements of their clients.




If there are multiple servers hosted by reverse proxy, the reverse proxy also determines the requests towards which servers. There could be multiple web servers offering the same service, but providing different types of resources, or a combination of both. They can utilize the HTTP protocol similarly to an ordinary web server, but they can also be equipped with protocols for application servers like FastCGI. You can create a reverse proxy to direct users to specific servers depending on the resource they are looking for, or to observe specific rules regarding traffic load.




Reverse proxy solutions also benefit from their positioning on top of web servers through the caching feature. Large static assets can be configured using caching rules to ensure that web servers are not hit with every request. Some solutions even allowing you to serve static content directly without having to connect to the web server in any way. Additionally the reverse proxy is able to handle compression of these assets.




The well-known Nginx web server is also used as a popular reverse proxy service. Although it is true that the Apache web server has a reverse proxy feature, it's an alternative option. Apache in contrast to Nginx was designed initially to focus on the reverse proxy feature.



Differentiating Forward Proxy from Reverse Proxy Use - Situations



Since "forward" as well as "reverse" are associated with an impression of directionality, they can lead to misleading comparisons to "incoming" and "outgoing" traffic These labels are confusing because both types of proxies manage the flow of requests as well as responses. A better approach to distinguish between forward and reverse proxy services is to consider the needs of the application you're creating.




Reverse proxy is an important feature when building a solution to deliver web applications to the internet. They are your web servers in any interaction with the internet.




Forward proxy applications are useful when they are placed in front of clients for personal use, or in a work setting. They can be used to represent the traffic of your client when you interact with the internet.




Utilizing case-based differentiation instead of focusing solely on the most common names can ensure that you don't become confused.



Conclusion



The article outlined what is a "proxy" is, with the two primary kinds being forward and reverse proxy. Practical applications and a discussion of beneficial features were utilized to distinguish between forward proxy from reverse proxy. If you're looking for ways to set up proxies, read our guide on how to set up Nginx as a web server and reverse proxy on Apache on an Ubuntu 20.04 server.



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