) -> bool | None:
    if lenient_issubclass(type_annotation, Request):
        dependant.request_param_name = param_name
        return True
    elif lenient_issubclass(type_annotation, WebSocket):
        dependant.websocket_param_name = param_name
        return True
    elif lenient_issubclass(type_annotation, HTTPConnection):
        dependant.http_connection_param_name = param_name

    if origin is not None:
        for arg in get_args(annotation):
            if lenient_issubclass(arg, (BaseModel, Enum)):
                if arg not in known_models:
                    known_models.add(arg)  # type: ignore[arg-type]  # ty: ignore[unused-ignore-comment]
                    if lenient_issubclass(arg, BaseModel):
                        get_flat_models_from_model(arg, known_models=known_models)

from fastapi import routing
from fastapi._compat import (
    ModelField,
    get_definitions,
    get_flat_models_from_fields,
    get_model_name_map,
    get_schema_from_model_field,
    lenient_issubclass,
)
from fastapi.datastructures import DefaultPlaceholder, _Unset
from fastapi.dependencies.models import Dependant
from fastapi.dependencies.utils import (
    _get_flat_fields_from_params,
    get_flat_dependant,