Aiohttp and NGINX running in Docker
Aiohttp is running on the port 8001 in the container toolservice, but your proxying to the port 80.
proxy_pass http://toolservice;Try proxying to 8001:
proxy_pass http://toolservice:8001;Maybe you will need to fix publishing of the port for toolservice container - I'm not 100% sure:
ports: - "8001:8001"