---
title: App应用对象
date: 2022-01-28 16:15:15:06
categories: [FastApi]
author: Anges黎梦
tags:
- Python
- FastApi
---
# 认识App应用对象FastAPI

**实例化应用对象**

```Python
app = FastAPI()
```

**查看源码**

```Python
class FastAPI(Starlette):
    def __init__(
        self,
        *,
        debug: bool = False,
        routes: Optional[List[BaseRoute]] = None,
        title: str = "FastAPI",
        description: str = "",
        version: str = "0.1.0",
        openapi_url: Optional[str] = "/openapi.json",
        openapi_tags: Optional[List[Dict[str, Any]]] = None,
        servers: Optional[List[Dict[str, Union[str, Any]]]] = None,
        dependencies: Optional[Sequence[Depends]] = None,
        default_response_class: Type[Response] = Default(JSONResponse),
        docs_url: Optional[str] = "/docs",
        redoc_url: Optional[str] = "/redoc",
        swagger_ui_oauth2_redirect_url: Optional[str] = "/docs/oauth2-redirect",
        swagger_ui_init_oauth: Optional[Dict[str, Any]] = None,
        middleware: Optional[Sequence[Middleware]] = None,
        exception_handlers: Optional[
            Dict[
                Union[int, Type[Exception]],
                Callable[[Request, Any], Coroutine[Any, Any, Response]],
            ]
        ] = None,
        on_startup: Optional[Sequence[Callable[[], Any]]] = None,
        on_shutdown: Optional[Sequence[Callable[[], Any]]] = None,
        terms_of_service: Optional[str] = None,
        contact: Optional[Dict[str, Union[str, Any]]] = None,
        license_info: Optional[Dict[str, Union[str, Any]]] = None,
        openapi_prefix: str = "",
        root_path: str = "",
        root_path_in_servers: bool = True,
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        deprecated: Optional[bool] = None,
        include_in_schema: bool = True,
        **extra: Any,
    ) -> None:
```

在源码中我们可以看到FastApi应用的配置项、以及它集成的接口文档