Why Proxy Sites Doesn't Work…For Everybody > 자유게시판

A proxy, also called the software for proxy servers acts in the role of an intermediary the server and client on the internet. In the absence of proxies, a user could send a request to an online service directly from a server and the server could serve the resource directly for the client. Although this method is easy to understand and implement but adding proxies offers benefits like improved performance and security, privacy, and much more. As an additional layer of pass-through, the proxy functions as a guardian for the internet between servers and clients.




Generally speaking, the combined mix of hardware for servers and installed proxy software is commonly called proxy servers. This article will focus on proxy servers that are typically classified as software in the context of web servers. This article will provide the full description of two types: the forward proxy and reverse proxy. reverse proxy. Each type of proxy has its own scenario, which is often misunderstood because of the identical terminology.




This article will provide you with information about what proxy services and their subtypes are and the way they work with a range of configurations. By reading this article, you will be able to identify the situations in which using proxies can be advantageous, and select the best option between reverse and forward proxy for any particular scenario.



Understanding Forward Proxies



The forward proxy sometimes called the open proxy serves as a representative for a client who wants to send a request via the internet to the server which originated it. In this scenario the entire attempt to send requests by the user is instead transmitted through the forward proxy. A forward proxy acting in place of the client, will look into the request. Then, it determines whether the user is authorised to send requests using this specific forward proxy. Then, it decides to reject any request, or send it to the source server. The client is not able to have direct access for the web. It is able to access only the information that the forward proxy allows the client to connect.




A common use of forward proxy is to provide greater privacy or security when using the internet. Forward proxy is able to access the internet on behalf of a client. in this way it can make use of a different IP address than the original IP address of the client.




Depending on how it's been configured depending on how it's set up, forward proxy may offer you a variety of features based the way it's configured and enables you to:




Don't be a victim of ad-tracking.


Circumvent surveillance.


Recognize restrictions based on location.




Forward proxies can also be used to secure systems that are centralised and also for access based on permissions for instance, such as at work. When all internet traffic passes through an open forward proxy the administrator can grant only a few clients connection to internet filtered by the standard firewall. Instead of setting up firewalls for the client layer that could include a variety of machines that have various environments and users, a firewall could be positioned at the intermediate layer of forward proxy.




It is important to remember that forward proxies need to be manually setup to use while reverse proxies will not be noticed by the user. Depending on the type the IP address that the user, they are transferred to the server that is originally through forward proxy Privacy and anonymity can be granted or denied.




There are many possibilities to think about when it comes to forward proxy services.




Apache An open source well-known web server, which offers forward proxy features.


Nginx is another widely-used open-source web server that has forward proxy capabilities.


Squid is a free forward proxy using an HTTP protocol. It doesn't provide the complete web server. We have an article on how to create Squid proxy to connect privately within Ubuntu 20.04.


Dante is forward proxy which uses the SOCKS protocol instead of HTTP and HTTP, which makes it better for usage scenarios like peer-to-peer communication. You can also learn how to set up Dante proxy to allow private connections in Ubuntu 20.04



Understanding Reverse Proxies



A reverse proxy functions as a representative of the web server which manages incoming requests from clients on its behalf. The web server could comprise a server, or multiple servers. Additionally, it can be an application-server, such as Gunicorn. In either of these scenarios the request will be made via the web in general. In the majority of cases requests will then be transmitted directly to the web server with the information the user is seeking. A reverse proxy serves as an intermediary and isolates the webserver from direct interaction via the open internet.




From the viewpoint of a user the experience of interacting with reverse proxy isn't different than communicating with an internet server direct. It's essentially the same but the client is unable to be able to discern the difference. The client asks for an item and receives it, with no further configuration needed by the client.




Reverse proxies can provide features such as:




Centralized security on webservers.


The direction of traffic coming in according to rules you have set.


New caching functionality has been added.




While centralized security is an advantage of both reverse and forward proxy servers. Reverse proxies provide this benefit only to that layer on the webserver and not the client layer. instead of the maintenance of firewalls in webserver level, that could include multiple servers and different configurations, the majority of firewall security is aimed to the reverse proxy layer. Additionally, removing the responsibility of interfacing with firewalls and communicating with requests from clients through web servers allows them to focus solely on the requirements of their clients.




If there are multiple servers operating with a reverse-proxy the reverse proxy also handles the direction that requests are directed towards which servers. Multiple web servers could be operating from the same host, each providing different types of resources or a combination of the two. They can utilize the HTTP protocol as a traditional web server, however they can also be equipped with applications server protocols, such as FastCGI. You can create a reverse proxy that directs users to a specific server according to the service requested, or to adhere to certain rules regarding the load of traffic.




Reverse proxies also gain from their placement over web servers by providing caching capabilities. The large static resources can be created using caching rules to prevent needing to connect with web servers every time. Certain solutions allow you to directly serve static files without having to communicate with the webserver for even one time. Furthermore reverse proxy solutions are able to handle compression of these assets.




The renowned Nginx web server functions as an extremely popular reverse proxy option. Even though Apache is also an alternative to reverse proxy, the Apache web server also has reverse proxy functions, but it's a distinct feature to Apache unlike Nginx was initially designed for focus on the reverse proxy feature.



Differentiating Forward Proxy and reverse Proxy Use



Because "forward" and "reverse" are both associated with a sense of directionality and misleading comparisons with "incoming" and "outgoing" traffic the labels could be confusing as both types of proxy services handle both requests and replies. The best method to distinguish between forward and reverse proxy providers is to look at the requirements of the application that you are developing.




Reverse proxy can be useful when you are developing a solution that can deliver web-based apps over the internet. They act as your web server during any interaction on the internet.




Forward proxy are helpful when placed in front of users for personal use, or in an office setting. They serve as a representation of the traffic of your client every time you connect to the internet.




Separating by use case rather than focusing solely on standard naming conventions can help make sure that you don't get confused.



Conclusion



This article provides the definition of a proxy, focusing on the two primary kinds, namely reverse proxy and forward proxy. Practical examples of how to use them and a look at beneficial features was used to differentiate between reverse and forward proxy. If you're looking to know more about the advantages of proxies, you can read our guide on how to set up Nginx as a reverse and web server proxy in Apache on one Ubuntu 20.04 Server.



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