[Python] FastAPI application with nginx. Staticfiles not working

I've a simple fastapi project. It is running correctly in pycharm and in the docker container. When running via nginx, the staticfiles are not delivered.

Structure is like this:

├── app
│ ├── main.py
│ ├── static_stuff
│ │ └── styles.css
│ └── templates
│ └── item.html
├── Dockerfile
├── requirements.txt



main.py

from fastapi import Request, FastAPI
from fastapi.responses import HTMLResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
import os.path as path


ROOT_PATH = path.abspath(path.join(__file__ ,"../"))

app = FastAPI(title="my_app", root_path='/my_app')
app.mount("/static_stuff", StaticFiles(directory=f"/{ROOT_PATH}/static_stuff"), name="static")
templates = Jinja2Templates(directory=f"/{ROOT_PATH}/templates")


@app.get("/items/{id}", response_class=HTMLResponse, include_in_schema=False)
async def read_item(request: Request, id: str):
return templates.TemplateResponse(
request=request, name="item.html", context={"id": id}
)


The application is running in a docker container:

Dockerfile:

FROM python:3.13-slim
WORKDIR /my_app
COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt
COPY app ./app
CMD ["gunicorn", "-k", "uvicorn.workers.UvicornWorker", "app.main:app", "--bind", "0.0.0.0:6543"]

EXPOSE 6543


The nginx configuration looks like this:

location /my_app {
proxy_pass http://my_host:6543;
include proxy_params;
}


When calling the nginx -> http://my_host/my_app/items/5

Everything works except the staticfiles. The styles.css is not found. What am I doing wrong?

I tried something like this, but I had no success

location ~ /static_stuff/(.+) {
proxy_pass http://my_host:6543;
include proxy_params;
}

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