Deploy your FastAPI application on AWS Lambda using API Gateway, Function URLs, and Lambda Layers
🚀 Deploy FastAPI on AWS Lambda with API Gateway & Functional URLs | Step-by-Step Tutorial
In this detailed video tutorial, you’ll learn how to deploy FastAPI applications on AWS Lambda using both API Gateway and Lambda’s Functional URL. The guide walks you through every essential step—from preparing your FastAPI code to creating Lambda Layers, setting up the AWS environment, and testing your deployment.
🔹 What You’ll Learn:
Full HTTP method support (GET, POST, PUT, DELETE) in FastAPI for Lambda.
How to integrate the Mangum adapter to make FastAPI work on AWS Lambda’s serverless platform.
Packaging Python dependencies into a Lambda Layer for lightweight, reusable deployments.
Setting up Lambda Functional URLs with CORS for quick testing.
Creating and configuring API Gateway with Lambda Proxy Integration for production-ready deployments.
Using proxy resources ({proxy+}) in API Gateway to automatically handle all FastAPI routes.
Testing the deployed API using tools like Postman.
💡 Key Takeaways:
✅ Mangum is essential to bridge FastAPI’s ASGI model with AWS Lambda’s event-based system.
✅ Lambda Layers simplify dependency management and reduce deployment package size.
✅ Always match Python runtime versions between local and AWS Lambda to avoid compatibility issues.
✅ Functional URLs are great for development and quick tests but are not recommended for production.
✅ API Gateway with Lambda Proxy Integration is best for production: scalable, secure, and flexible.
✅ Use the {proxy+} shortcut to automatically forward all HTTP requests to FastAPI, saving time and reducing manual configuration.
✅ Test your deployment properly using Postman to ensure all API endpoints function as expected.
🔍 Why API Gateway is Preferred for Production: While Lambda Functional URLs are easy to set up, they lack advanced features like throttling, monitoring, authentication, and custom domain support. API Gateway offers better control, scalability, and security for your production APIs.
🔥 Whether you’re building a simple serverless app or a complex API backend, this tutorial gives you the tools and best practices to deploy FastAPI efficiently on AWS.
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