diff --git a/nonebot/adapters/onebot/v11/adapter.py b/nonebot/adapters/onebot/v11/adapter.py
index 3376b4f7..5e301cd6 100644
--- a/nonebot/adapters/onebot/v11/adapter.py
+++ b/nonebot/adapters/onebot/v11/adapter.py
@@ -149,7 +149,7 @@ async def _call_api(self, bot: Bot, api: str, **data: Any) -> Any:
                 raise NetworkError(f"WebSocket call api {api} timeout") from None
 
         elif isinstance(self.driver, HTTPClientMixin):
-            api_root = self.onebot_config.onebot_api_roots.get(bot.self_id)
+            api_root = str(self.onebot_config.onebot_api_roots.get(bot.self_id))
             if not api_root:
                 raise ApiNotAvailable
             elif not api_root.endswith("/"):
@@ -298,6 +298,7 @@ def _check_access_token(self, request: Request) -> Optional[Response]:
 
     async def _start_forward(self) -> None:
         for url in self.onebot_config.onebot_ws_urls:
+            url = str(url)
             try:
                 ws_url = URL(url)
                 self.tasks.append(asyncio.create_task(self._forward_ws(ws_url)))
diff --git a/nonebot/adapters/onebot/v12/adapter.py b/nonebot/adapters/onebot/v12/adapter.py
index 50787b8f..42433f3c 100644
--- a/nonebot/adapters/onebot/v12/adapter.py
+++ b/nonebot/adapters/onebot/v12/adapter.py
@@ -201,7 +201,7 @@ async def _call_api(self, bot: Bot, api: str, **data: Any) -> Any:
                 raise NetworkError(f"WebSocket call api {api} timeout") from None
 
         elif isinstance(self.driver, HTTPClientMixin):
-            api_url = self.onebot_config.onebot_api_roots.get(bot.self_id)
+            api_url = str(self.onebot_config.onebot_api_roots.get(bot.self_id))
             if not api_url:
                 raise ApiNotAvailable
 
@@ -414,6 +414,7 @@ def _check_access_token(self, request: Request) -> Optional[Response]:
 
     async def _start_forward(self) -> None:
         for url in self.onebot_config.onebot_ws_urls:
+            url = str(url)
             try:
                 ws_url = URL(url)
                 self.tasks.append(asyncio.create_task(self._forward_ws(ws_url)))