β˜„οΈ Proxy Servers & βš–οΈ Load Balancer

GunhoΒ·2025λ…„ 1μ›” 4일
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πŸ—» Overview

🎭 Proxy Servers and a βš–οΈ Load Balancer can be abstracted as an intermediary between a client and a server.

Hence ⛩️ API Gateway is their super set.

In the following sections, the following topics will be discussed:

  • 🌝 Forward Proxy
  • 🌚 Reverse Proxy
  • βš–οΈ Load Balancer

where concisely, forward and reverse proxies as their names may suggest, refer to the position of a proxy server.

Wikipedia Available at here


🌝 Forward Proxy

🌝 Forward Proxy is a proxy server that is positioned between a client and the internet where a Forward Proxy becomes a proxy for a client.

Forward Proxy receives all requests from the clients, and on behalf of these clients, a Forward Proxy may then send a request to a server as a proxy.

Forward Proxy is mostly used for:

  • Cliient Anonymity

    • in which a server is not aware of from where a request has been fetched.

  • Caching

    • caches a response.

  • Contents Filtering

    • filters a response (e.g. adults, user-preferences, etc).

    • can block access to the sites on the blacklists too (e.g. government-blocked, school-blocked).

  • Encryption

    • can encrypt a request to a server-compatible encrypted request.

  • Traffic Control

    • can limit the allowed requests in a certain window.

CloudFlare Available at here


🌚 Reverse Proxy

🌚 Reverse Proxy is a proxy server that is situated between the internet and a server where it becomes a reverse to a forward proxy. A Reverse Proxy is a proxy for a server.

Reverse Proxy receives all requests on behalf of a server and further fetches those requests to the relevant servers if necessary. A Reverse Proxy then, after receiving a response from a server, may send such response to a client.

Reverse Proxy is specifically designed to improve server-side performances, and may achieve it via:

  • Load Balancing

    • can distribute the incoming requests evenly across the valid servers.

  • Server Anonymity

    • enhances security-related features (e.g. DDoS Attacks).

  • Caching

    • caches responses.

  • Encryption & Decryption

    • can decrypt a request and encrypt a response to a client-compatible encrypted response.

CloudFlare Available at here


βš–οΈ Load Balancer

βš–οΈ Load balancing is a technique that evenly distributes user requests across multiple servers to prevent any single server from becoming overloaded. This enables the improved availability and reliability of the service.

Load Balancer can be either implemented via a Reverse Proxy or a API Gateway or perhaps any developer-customised layers between the servers and the clients.

Often used algorithms for Load Balancing are:

  • Round Robin
  • IP Hash
  • Least Connection

... and more.

πŸ“š References

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Edward Evans
2025λ…„ 9μ›” 27일

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