How to use CONSUL_ API_ PREFIX?

I set the environment variable CONSUL_ API_ PREFIX, but it doesn't seem to be working

consul 1.16.0
server centos7
docker-compose.yml:
```
version: '3'

services:
consul:
image: consul
container_name: consul
environment:
CONSUL_API_PREFIX: consul/
volumes:
- ./consul/config:/consul/config
- ./consul/data:/consul/data
ports:
- "8500:8500"
- "8600:8600/tcp"
- "8600:8600/udp"

nginx:
image: nginx
container_name: nginx
volumes:
- ./nginx/config/conf.d/:/etc/nginx/conf.d/
- ./nginx/log:/var/log/nginx
- ./nginx/html:/usr/share/nginx/html
ports:
- 80:80
```

The api url has not changed

What should I do？

Start by reviewing the CONSUL_API_PREFIX setting in the provided docker-compose.yml and checking how Consul 1.16.0 documents or applies that variable. Compare the configured value with the API URL shown in the report; done means determining why the URL does or does not receive the expected prefix and documenting the required configuration.

Written by the indexing model from the issue text.