什么是 Service Worker？

By running Python ASGI web applications entirely in the browser using Pyodide and a dedicated service worker, this project intercepts all same-origin requests under `/app/` and executes them against the Python app via the ASGI protocol—removing the need for a backend server except for static files. The mechanism is demonstrated with both a FastAPI demo and the full Datasette app, confirming its generality across ASGI apps.

This article discusses how to build a Google Drive sync engine that runs smoothly within the strict limits of MV3 service workers, focusing on in-memory state management, offline handling, and replacing the Google SDK with native Fetch.