app_mixed = FastAPI(strict_content_type=True)
mixed_outer = APIRouter(prefix="/outer", strict_content_type=False)
mixed_inner = APIRouter(prefix="/inner", strict_content_type=True)


@mixed_outer.post("/items/")
async def mixed_outer_post(data: dict):
    return data


@mixed_inner.post("/items/")
async def mixed_inner_post(data: dict):
    return data


mixed_outer.include_router(mixed_inner)
app_mixed.include_router(mixed_outer)