FastAPI Load Balancer - Source Code

This source code is for a high-performance, lightweight load balancer built using FastAPI.

It efficiently distributes incoming traffic across multiple backend servers, ensuring improved reliability, scalability, and performance for web applications.

The load balancer supports three industry-standard algorithms:

• Round Robin – Cycles through servers sequentially.

• Least Connections – Routes traffic to the server with the fewest active connections.

• IP Hash – Ensures requests from the same client IP always go to the same backend server.

Features

✅ High Performance – Uses FastAPI’s asynchronous capabilities for optimal request handling.
✅ Multiple Load Balancing Algorithms – Supports dynamic selection of different strategies.
✅ Health Checks – Avoids routing traffic to failed or unresponsive servers.
✅ Session Persistence – Ensures clients consistently reach the same backend when needed.
✅ Scalability – Easily add or remove backend servers as traffic grows.
✅ Lightweight & Fast – Runs with minimal system resources, making it ideal for cloud and containerized deployments.

Use Cases

🔹 Web applications needing traffic distribution across multiple backend servers.
🔹 API gateway solutions for microservices architecture.
🔹 Cloud and edge computing environments requiring lightweight traffic management.
🔹 Load testing and performance monitoring of backend services.

Technology Stack

• FastAPI – High-performance Python web framework.

• Uvicorn – ASGI server for handling concurrent requests.

• HTTPX – Asynchronous HTTP client for making backend requests.

• Python 3.8+ – Modern Python syntax and async support.