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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.

Uvicorn at a glance
PropertyDetail
ProtocolASGI 3.0
HTTP supportHTTP/1.1
WebSocket supportYes - websockets or wsproto
Event loopasyncio (default) or uvloop
HTTP parserh11 (default) or httptools
LicenseBSD
Minimum Python3.10+ (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.

What server interface does Uvicorn implement?
What is the minimum Python version required by Uvicorn 0.40.0 (December 2025)?

More Related questions...

What is Uvicorn and what problem does it solve for Python web development? What is ASGI and how does it differ from WSGI? How do you install Uvicorn and what is the difference between the minimal and standard installations? How do you run a basic Uvicorn server from the command line? What are Uvicorn's default host, port, and log level settings? What is uvloop and how does it improve Uvicorn's performance? What are httptools and h11, and when would you choose each? How does Uvicorn's --reload flag work and what does it require? How do you run Uvicorn programmatically using uvicorn.run() and uvicorn.Config/Server? What are Uvicorn workers and how do you configure multi-process deployments? How do you deploy Uvicorn with Gunicorn for production? How do you configure SSL/TLS (HTTPS) in Uvicorn? What is the ASGI lifespan protocol and how does Uvicorn support it? How do you configure Uvicorn logging and access logs? What are proxy headers in Uvicorn and how do you configure trusted proxies? How does Uvicorn handle WebSocket connections? What is the --root-path setting in Uvicorn and when do you need it? How do you use Uvicorn with a Unix domain socket instead of a TCP port? What is the --factory flag in Uvicorn and when is it useful? How do you configure Uvicorn with environment variables? What is Uvicorn's --interface flag and what application types does it support? How do you run Uvicorn inside a Docker container? What is the difference between Uvicorn, Hypercorn, and Daphne as ASGI servers? How do you handle graceful shutdown in Uvicorn? What are the key Uvicorn settings for a production-hardened deployment? How do you run Uvicorn with systemd for automatic restarts and log rotation? What is the relationship between Uvicorn and FastAPI? How do you configure Uvicorn's timeout settings? How do you write a minimal ASGI application that works with Uvicorn without any framework? How do you configure Uvicorn's log config file for custom logging formats? What is the --app-dir flag in Uvicorn and when do you need it? How do you test a Uvicorn-served ASGI application without starting the server? What is Granian and how does it compare to Uvicorn as an ASGI server alternative? What is the scope dictionary in the ASGI protocol and what does it contain? What are best practices for deploying Uvicorn in a Kubernetes environment?
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