Python / Uvicorn Fundamentals Interview Questions
What is Uvicorn and what problem does it solve for Python web development?
Uvicorn is a lightning-fast ASGI (Asynchronous Server Gateway Interface) web server for Python. It is the production-grade server that runs modern async Python frameworks like FastAPI and Starlette, bridging the gap between the network and the application code.
Before ASGI, Python web servers used the older WSGI (Web Server Gateway Interface) standard - a synchronous protocol that could not natively support async programming, WebSockets, or long-lived connections. Uvicorn implements ASGI, providing a minimal, high-performance server that unlocks the full power of Python's asyncio ecosystem.
| Property | Detail |
|---|---|
| Protocol | ASGI 3.0 |
| HTTP support | HTTP/1.1 |
| WebSocket support | Yes - websockets or wsproto |
| Event loop | asyncio (default) or uvloop |
| HTTP parser | h11 (default) or httptools |
| License | BSD |
| Minimum Python | 3.10+ (as of uvicorn 0.40.0, December 2025) |
Uvicorn is typically used in two ways: directly for development (single process) and as a worker class inside Gunicorn for production multi-process deployments.
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