What happens when an HTTP request reaches FastAPI?
A single GET request crosses a socket, an ASGI server, a router, a dependency graph, and a serializer. Here is what each layer does, and where it can fail.
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#python
2 articles
How FastAPI resolves a dependency
One Depends parameter can hide a tree of sub-dependencies, per-request cache entries, and cleanup code. Follow the solve order and see where request-scoped resources begin and end.