}
                    },
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "x-aperture-labs-portal": "blue",
                }
            }
        },

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/", openapi_extra={"x-aperture-labs-portal": "blue"})
async def read_items():

                different domains and you want to use the same Swagger UI in the
                browser to interact with each of them (instead of having multiple
                browser tabs open). Or if you want to leave fixed the possible URLs.

                If the servers `list` is not provided, or is an empty `list`, the
                default value would be a `dict` with a `url` value of `/`.