Proxy Defined
A proxy is a software that makes requests on behalf of a client or a server, acting as a middleman between the client and server or server and client.
When you visit a website, you first type the address in the browser, and then the website is retrieved from the server where it resides.
When a client uses a proxy, the proxy acts like a messenger; it receives the request from the user's computer, sends it to the server, receives the response from the server, and then sends it to the user's computer.
The reasons why a proxy server is used include:
Privacy: A proxy server makes it possible to use the internet anonymously.
Speed: A proxy server makes it faster to retrieve data.
Bandwidth: It saves bandwidth by storing data in cache for easy retrieval.
Activity Logging: Companies can use it to keep records of websites employees visit, and it can also be used to block certain websites for security reasons.
There are two main types of proxy:
Forward Proxy
Reverse Proxy
Forward Proxy
Forward proxy servers act on behalf of clients, forwarding requests to servers while hiding the client's identity. It acts as an intermediary for clients when they make a request to a server.
Key characteristics of a forward proxy include:
A forward proxy hides the client's IP address from servers.
A forward proxy can be used to control and filter content, allowing you to block specific website content.
A forward proxy bypasses geo-restrictions to access content that is not available in certain regions.
A forward proxy caches frequently asked content.
A forward proxy is configured on the client's side.
Benefits of Forward Proxy
Anonymity: A forward proxy hides the client’s Ip address and prevents servers from tracking the user's activity. This protects users' privacy by concealing the user's identity.
Content Filtering: Forward proxies are used in organizations, businesses, and educational institutions to block access to certain websites, monitor internet usage, and enforce security policies.
Bypass Content Restrictions: Forward proxies can be used to access content that may be restricted in a user's region.
Security: Forward proxies can scan and block malicious content from unsafe websites that may want to inject a website with malware or phishing attacks.
Caching: Forward proxies can cache frequently requested resources and deliver them without contacting the server, which improves performance
Limitations of Forward Proxy
Performance Issues: A forward proxy can introduce latency if it is not configured to cache content. This can slow down performance in network activity.
Single point of Failure: If the forward proxy fail it can disrupt internet access for all connected clients.
Potential Risk of Detection: Forward proxy does not provide 100% anonymity, there are still risks of detection. Using a VPN in addition can help to encrypt network traffic as well.
Common use cases of Forward Proxies
Ad verification: A forward proxy can be used by marketers to view and analyse how advertisements are displayed to the target audience.
Data Scraping: Forward proxies can help users during data scraping because users can use multiple IPs to prevent being restricted.
Researching: Academic and business researchers can use forward proxies to get information from websites on restricted resources
Streaming: A forward proxy can be used to access blocked content on some streaming sites that are not available in their region.
Reverse Proxy
A reverse proxy is the direction in which a proxy operates. It receives a connection request from the client, forwards it to the backend server, and then returns the server's response to the client.
Think of its role like that of a middleman that serves the server and not the client.
Key characteristics of a reverse proxy include:
Provides load balancing by distributing traffic across different servers.
Protects origin servers from attacks
Caches content for faster performance
Encrypts and decrypts incoming requests and outgoing responses.
Benefits of Reverse Proxy
Reasons why companies use reverse proxy include the following:
Caching: A reverse proxy server can temporarily store responses so that when a user requests the same resource again, it does not need to prefetch it from the server; instead, it delivers the cached response directly, improving performance.
Load Balancing: A reverse proxy can help with load balancing, which involves distributing incoming traffic across different servers to prevent servers from being overloaded, and even when a server fails, other servers can handle the traffic.
SSL Encryption: A reverse proxy can be configured to handle SSL/TLS encryption, meaning that it can decrypt incoming requests and encrypt outgoing responses on behalf of the server, which protects sensitive data in transit, such as passwords, payment information, and other sensitive information.
A reverse proxy can manage SSL certificates in one place so that hosting providers do not have to install, renew, or update certificates individually.
Zero Downtime: A reverse proxy can shift traffic load from an old version of an application to a new one so that when businesses are deploying new updates, there is zero downtime.
Security: Reverse proxy conceals the IP address of origin servers, preventing attackers from carrying out attacks like DDoS. When an attack hits a reverse proxy, the hosting provider can then tighten security to prevent future attacks.
Limitations of Reverse Proxy
Resource Intensive: A reverse proxy can be resource-intensive because it requires computing resources that can handle load balancing, which can lead to investing in powerful hardware and virtual machines.
Latency: A reverse proxy is at the centre of communication between the client and server, and this extra layer can introduce latency, which affects performance if the proxy is configured incorrectly.
Complex Infrastructure: A reverse proxy can make a network infrastructure a little bit complex, for example, it has to be configured in a way that it can forward requests to the backend server correctly, handle SSL encryption, and manage other things like caching, authentication, and more, to prevent security or performance issues.
Single Point of Failure: In the case where a reverse proxy fails, it can affect the backend servers it manages. This can be avoided if there are redundancy and failover mechanisms to protect services during a disruption.
Performance Bottlenecks: If a reverse proxy doesn’t have enough resources to handle high traffic, it can slow down the server, resulting in poor performance.
Common use cases of Reverse Proxy
Banking and financial services: use reverse proxies to filter malicious traffic, control access to internal services, and protect backend systems.
Media and Streaming industry: use reverse proxies to cache videos, distribute traffic globally, and reduce server load.
Cloud platforms: use reverse proxies to hide server IP addresses, control traffic across multiple servers, and improve server performance through caching.
What do forward and reverse proxies do on a hostiNg server?
A reverse proxy is an intermediary between the server and incoming requests from clients. When the IP address of an origin server is hidden, it is not exposed to targeted attacks.
Reverse proxy also improves performance by caching frequently requested resources so that when the same client requests the same resource, it delivers without contacting the server.
A reverse proxy also handles SSL/TLS encryption and helps with load balancing when there’s a lot of incoming traffic by distributing it across multiple servers.
A forward proxy, on the other hand, is an intermediary between the client and server, this means that it is more client-focused.
Forward Proxy vs Reverse Proxy
Forward Proxy | Reverse Proxy |
A forward proxy hides the client's IP address from a website. | A reverse proxy conceals a server's IP address from the Internet or client. |
A forward proxy can cache frequently requested content for better performance. | A reverse proxy can cache frequently requested content and distribute traffic between multiple servers when there’s high traffic. |
A forward proxy can block malicious websites.
| A reverse proxy protects servers against malicious requests, and it can also handle SSL/TLS encryption |
A forward proxy can be used in schools, cooperate and public environments. | A reverse proxy can be used in SaaS environments and high-traffic websites like microservices, streaming platforms, etc. |
A forward proxy can be used to monitor and control user access to the internet
| A reverse proxy manages and filters incoming traffic. |
