diff --git a/nonebot/__init__.py b/nonebot/__init__.py
index 5040d70b..a796b53c 100644
--- a/nonebot/__init__.py
+++ b/nonebot/__init__.py
@@ -30,13 +30,13 @@
 
 import importlib
 import pkg_resources
-from typing import Dict, Type, Optional
+from typing import Any, Dict, Type, Optional
 
 from nonebot.adapters import Bot
-from nonebot.drivers import Driver
 from nonebot.utils import escape_tag
 from nonebot.config import Env, Config
 from nonebot.log import logger, default_filter
+from nonebot.drivers import Driver, ForwardDriver, ReverseDriver
 
 try:
     _dist: pkg_resources.Distribution = pkg_resources.get_distribution(
@@ -76,8 +76,7 @@ def get_driver() -> Driver:
     return _driver
 
 
-# FIXME: app for reverse driver
-def get_app():
+def get_app() -> Any:
     """
     :说明:
 
@@ -99,11 +98,13 @@ def get_app():
 
     """
     driver = get_driver()
+    assert isinstance(
+        driver,
+        ReverseDriver), "app object is only available for reverse driver"
     return driver.server_app
 
 
-# FIXME: asgi for reverse driver
-def get_asgi():
+def get_asgi() -> Any:
     """
     :说明:
 
@@ -125,6 +126,9 @@ def get_asgi():
 
     """
     driver = get_driver()
+    assert isinstance(
+        driver,
+        ReverseDriver), "asgi object is only available for reverse driver"
     return driver.asgi
 
 
diff --git a/nonebot/drivers/__init__.py b/nonebot/drivers/__init__.py
index 9cd87cdc..e3237368 100644
--- a/nonebot/drivers/__init__.py
+++ b/nonebot/drivers/__init__.py
@@ -8,7 +8,7 @@
 import abc
 import asyncio
 from dataclasses import dataclass, field
-from typing import Set, Dict, Type, Optional, Callable, TYPE_CHECKING
+from typing import Any, Set, Dict, Type, Optional, Callable, TYPE_CHECKING
 
 from nonebot.log import logger
 from nonebot.config import Env, Config
@@ -199,6 +199,7 @@ class Driver(abc.ABC):
         asyncio.create_task(_run_hook(bot))
 
 
+# TODO: issue #240
 class ForwardDriver(Driver):
     pass
 
@@ -210,26 +211,16 @@ class ReverseDriver(Driver):
 
     @property
     @abc.abstractmethod
-    def server_app(self):
+    def server_app(self) -> Any:
         """驱动 APP 对象"""
         raise NotImplementedError
 
     @property
     @abc.abstractmethod
-    def asgi(self):
+    def asgi(self) -> Any:
         """驱动 ASGI 对象"""
         raise NotImplementedError
 
-    @abc.abstractmethod
-    async def _handle_http(self, *args, **kwargs):
-        """用于处理 HTTP 类型请求的函数"""
-        raise NotImplementedError
-
-    @abc.abstractmethod
-    async def _handle_ws_reverse(self, *args, **kwargs):
-        """用于处理 WebSocket 类型请求的函数"""
-        raise NotImplementedError
-
 
 @dataclass
 class HTTPConnection(abc.ABC):
diff --git a/nonebot/drivers/fastapi.py b/nonebot/drivers/fastapi.py
index a37286e6..c9de4107 100644
--- a/nonebot/drivers/fastapi.py
+++ b/nonebot/drivers/fastapi.py
@@ -118,7 +118,7 @@ class Driver(ReverseDriver):
 
     @property
     @overrides(ReverseDriver)
-    def asgi(self):
+    def asgi(self) -> FastAPI:
         """``FastAPI APP`` 对象"""
         return self._server_app
 
@@ -175,7 +175,6 @@ class Driver(ReverseDriver):
                     log_config=LOGGING_CONFIG,
                     **kwargs)
 
-    @overrides(ReverseDriver)
     async def _handle_http(self, adapter: str, request: Request):
         data = await request.body()
 
@@ -209,7 +208,6 @@ class Driver(ReverseDriver):
         return Response(response and response.body,
                         response and response.status or 200)
 
-    @overrides(ReverseDriver)
     async def _handle_ws_reverse(self, adapter: str,
                                  websocket: FastAPIWebSocket):
         ws = WebSocket(websocket.scope.get("http_version",