All About Proxy Sites > 자유게시판

An proxy or proxy server is a program that sits in the middle between a client and server over the internet. Without a proxy, a client will send a request to an item directly a server, and the server would serve that resource to its user directly. Although this method is easy to grasp and use but adding proxies offers advantages such as increased performance, privacy and security, among others. As an additional layer passing through, proxies act as a security layer for the internet between servers and users.




In general, the bundled package of server hardware with the software to install proxy servers is usually called proxy servers. But, this article will focus on proxy servers which are generally described as software, as well as those employed together with web servers. We will give a synopsis of the two primary types of proxies: they are forward proxy and a reverse proxy. Each has its own usage which may be confusing due to a similar terminology.




This article will provide you with an understanding of types of proxies and subtypes they are, as well as their value in a variety of configurations. Through in this post, you'll understand what situations where proxies are useful, and choose the best choice to use a forward or reverse proxy based on the situation.



Understanding Forward Proxies



Forward proxy, also referred to in the context of open proxy. An open proxy acts as a representative for a user who attempts to send an online request to an source server. In this case, the whole attempt to send requests from the client is instead controlled by the forward proxy. A forward-proxy, in lieu of the user will review the request. The first step is to check if the client been granted permission to send requests through this specific forward proxy. It will then reject an request and forward it to the origin server. The client has no direct access directly to internet. It can access only what the forward proxy permits it to access.




The most frequent use of forward proxy is increased security or privacy online. Forward proxy connects to the internet in place of a client, and during this process, it uses an alternate IP address to the client's initial IP address.




Based on how it was configured according to the configuration, forward proxy may provide a variety of functions depending on how it's set up, allowing users to:




Beware of ad-tracker.


Circumvent surveillance.


Identify restrictions based on the location you are in.




Forward proxies also are used in systems that use centralized security and based access, for instance at workplaces. If all internet traffic flows through an common forward proxy layer, an administrator can limit access to only a small user group to the internet filtered through an common firewall. Instead of putting firewalls in place on the client layer, which may comprise several devices with diverse environments and users, there is the possibility to install an firewall that is located in the layer that forwards proxy traffic.




It is crucial to keep in mind the fact that forward proxy servers must be manually configured for be utilized, whereas reverse proxy servers may be hidden from clients. Depending on the type of IP address the client, it will be passed to the server that created it through forward proxy, privacy and security can be granted or left secret.




There are a variety of options to be considered when it comes to forward proxy options:




Apache The most well-known open source web server with forward proxy capabilities.


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


Squid is an open-source forward proxy which uses the HTTP protocol. Squid doesn't come with a complete website server software. You can read our instructions on how to set-up Squid proxy to allow private connections in Ubuntu 20.04.


Dante Forward Proxy that utilizes the SOCKS protocol instead HTTP, making it better suited to use in instances like peer-to-peer communication. You can also understand how to configure a Dante proxy to allow private connections on Ubuntu 20.04



Understanding Reverse Proxies



A reverse proxy functions as a representative of web servers that handle the incoming requests of clients on behalf of. The web server could be a single server or several servers. It could also serve as an app server such as Gunicorn. In any case, the request will come from users on the internet generally. In the majority of cases requests will get sent directly to the web server which has all the resources that the user is requires. In contrast reverse proxy acts as an intermediary that isolates Web servers from direct interaction with the internet.




From a consumer's point perspective, using reverse proxy is not different from using an internet server direct. It's basically the same, and the client cannot discern the distinction. The client asks for the resource, and it then gets it without any additional configuration needed to be done by the customer.




Reverse proxies provide features such as:




A centralized layer of security to protect the server.


Controlling traffic inbound based on rules that you can set up.


A new feature for caching is now available.




While centralized security is a benefit of both forward and reverse proxy, reverse proxies do this to only the server layer and not the layer that clients use. Instead of establishing firewalls on Web server layers which can include multiple servers and various configurations, the majority of security measures for firewalls are targeted towards the reverse proxy layer. Furthermore, taking the burden of communicating with firewalls and communicating with clients that are not web servers enables the firewall to concentrate on addressing the needs of their customers.




If there are several servers running in a reverse proxy it also controls which requests are directed to which servers. A number of web servers could be operating from the same host, providing various kinds of services or a combination of both. They use the HTTP protocol just like a conventional web server. However, they can be equipped with applications server protocols such as FastCGI. You can configure a reverse proxy to direct the clients towards specific servers based on the kind of resource they are searching for, or adhere to certain rules for traffic load.




Reverse proxies are also able to gain advantages from their positioning before web servers, by providing caching functions. Large static assets are able to be configured with caching rules to avoid having to contact web servers for every request. Certain software solutions allow you to deliver static files directly without having to contact the server once. In addition, the reverse proxy can manage compression of these assets.




The popular Nginx web server also functions as an effective reverse proxy service. While it is true it is true that Apache web server is outfitted with a reverse proxy, it can be used in conjunction with Apache however Nginx was initially designed to and is primarily focused on the reverse proxy feature.



Differentiating Forward Proxy and Reverse Proxy Examples



Because "forward" as well as "reverse" come with connotations of directionality and false comparisons to "incoming" and "outgoing" traffic and can be confusing since both types of proxies process requests and response. The best way to differentiate between forward and reverse proxy is to think about the requirements of the app that you're working on.




A reverse proxy is useful in the case of designing a system to provide web-based services via the internet. They serve as your servers when you interact with the Internet.




Forward proxy software is useful when they are presented to the client for your personal usage as well as in an office context. They represent your clients when you connect to the internet.




A case-based distinction instead of focusing on the commonly used naming conventions can help you to avoid confusion.



Conclusion



This article clarified what a proxy is with two types: forward proxy and the reverse proxy. Practical applications and an exploration of useful features were utilized to distinguish between forward and reverse proxies. If you're interested in exploring the ways to implement proxies, you can follow our guide on how to configure Nginx as an internet server and reverse proxy on Apache using the Ubuntu 20.04 server.



In case you loved this article and you would like to receive more details with regards to Proxy Sites (blogs.uoregon.edu) generously visit our own page.