Uvicorn: ASGI Web Server for Python

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The official documentation for Uvicorn introduces the asynchronous Python web server, which implements the ASGI specification and supports HTTP/1.1 and WebSockets.

Key points

  1. Uvicorn provides an ASGI server implementation for asynchronous Python frameworks, supporting HTTP/1.1 and WebSockets.
  2. Installation is handled via standard package managers such as pip or uv.
  3. Applications can be launched via the CLI tool or programmatically using uvicorn.run() as well as custom Config and Server instances.
  4. Running behind Gunicorn is recommended for production environments to leverage process management.
  5. The built-in uvicorn.workers module is deprecated and slated for removal, with the standalone uvicorn-worker package recommended as its replacement.

Why it matters

Uvicorn serves as the backbone for high-performance Python web applications built on modern frameworks such as FastAPI. Clear guidance on execution modes and deployment patterns is essential for running reliable async workloads.

Analysis

The overview covers installation, programmatic control, and execution strategies. A critical operational detail is the deprecation warning for uvicorn.workers, signaling to DevOps and infrastructure teams that production deployments relying on Gunicorn must migrate to the dedicated uvicorn-worker package.

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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