Running Python ASGI apps in the browser via Pyodide + a service worker

This article explores a novel approach to running Python ASGI web applications entirely in the browser via Pyodide (WebAssembly) and a dedicated service worker. By intercepting same-origin requests under `/app/` and executing them against the Python app using the ASGI protocol, the need for a backend server is eliminated except for static files. The method is demonstrated with a FastAPI demo and the full Datasette app, showcasing its generality. The author discusses overcoming limitations of previous Web Worker-based approaches, such as broken JavaScript execution, and plans to upgrade Datasette Lite accordingly.