Lab: one domain error, two transports¶

One service with a FastAPI entrypoint and a gRPC entrypoint over the same use case. The use case raises ServiceError subclasses and a plain RuntimeError; the driver calls both transports for every case and prints what each told the caller.

uv venv --python 3.13 .venv
uv pip install --python .venv/bin/python "servicewright[fastapi,grpc]==0.10.1" "httpx==0.28.1"
.venv/bin/python driver.py