How to show docs with nginx url prefix set?

I have project which uses flask-smorest and when I run it locally it shows docs on url `/docs/swagger`. But on my production server I have in nginx setup to append `api/` prefix on each url and then docs are not showing because flask-smorest expects openapi.json on `docs/openapi.json` but mine nginx append `api/` and openapi.json is visible on url `api/docs/openapi.json` so I keep getting error:


So basically how to setup configuration so it loads docs? Here are mine configuration in project for flask-smorest:

```

app = Flask(__name__)
app.config["API_TITLE"] = "Test API"
app.config["API_VERSION"] = "v1"
app.config["OPENAPI_VERSION"] = "3.0.2"
app.config["OPENAPI_URL_PREFIX"] = "/docs"
app.config["OPENAPI_REDOC_PATH"] = "/redoc"
app.config["OPENAPI_REDOC_URL"] = "https://cdn.jsdelivr.net/npm/redoc@2.0.0-rc.30/bundles/redoc.standalone.js"
app.config["OPENAPI_SWAGGER_UI_PATH"] = "/swagger"
app.config["OPENAPI_SWAGGER_UI_URL"] = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@3.25.5/"

api = Api(app)
api.register_blueprint(blp_test)
```

Start with the Flask-Smorest configuration shown in the issue, then trace how OPENAPI_URL_PREFIX, OPENAPI_SWAGGER_UI_PATH, and the generated schema URL interact with the nginx api/ prefix. Confirm the configuration and proxy behavior against the reported URLs; done means the Swagger UI loads and retrieves the schema at the prefixed endpoint.

Written by the indexing model from the issue text.