* `url`: (`str`) A URL pointing to the contact information. MUST be in
                    the format of a URL.
                * `email`: (`str`) The email address of the contact person/organization.
                    MUST be in the format of an email address.

                It will be added to the generated OpenAPI (e.g. visible at `/docs`).

                Read more at the

import asyncio
import dataclasses
import email.message
import inspect
import json
from contextlib import AsyncExitStack
from enum import Enum, IntEnum
from typing import (
    Any,
    Callable,
    Coroutine,
    Dict,
    List,
    Optional,
    Sequence,
    Set,
    Tuple,
    Type,
    Union,
)

from fastapi import params
from fastapi._compat import (
    ModelField,
    Undefined,