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Path operation functions handle requests

Dependency injection system for shared services

Middleware for request/response processing

Asynchronous route handling via async/await

Automatic schema generation via type hints

Request received by ASGI server

Middleware optionally processes request

Path operation function executes business logic

Response generated and returned

OpenAPI docs auto-generated from type hints

ASGI async request handling

Dependency injection for services

Middleware for request/response pipeline

Service layer for business logic

Routing layer for URL mapping

High-performance REST API serving thousands of requests/sec

ML model serving with async endpoints

Microservices with async workflows

WebSocket endpoints for real-time updates

Event-driven system with async background tasks

High performance with async I/O

Developer productivity and readability

Automatic data validation and documentation

Minimal boilerplate

Extensible and modular design

Use async functions for concurrent requests

Leverage Uvicorn/Gunicorn for multiple workers

Use connection pooling for databases

Horizontal scaling with multiple server instances

Monitor with Prometheus or similar tools

Update Python and FastAPI version

Refactor deprecated API calls

Test path operations and dependencies

Deploy incrementally in production

Monitor logs and performance