diff --git a/app.py b/app.py
index c0d4912..7444c87 100644
--- a/app.py
+++ b/app.py
@@ -1,8 +1,5 @@
-from typing import AsyncGenerator
-
 from fastapi import FastAPI, Request, Depends
 from fastapi.responses import StreamingResponse, JSONResponse
-
 from chatgpt.ChatService import ChatService
 from utils.authorization import verify_token
 from utils.retry import async_retry
@@ -10,33 +7,50 @@ from utils.retry import async_retry
 app = FastAPI()
 
 
+async def to_send_conversation(request_data, access_token):
+    """
+    对话前先决条件准备
+    :param request_data: 请求数据
+    :param access_token: 访问令牌
+    :return: chat_service
+    """
+    chat_service = ChatService(request_data, access_token)
+    await chat_service.get_chat_requirements()
+    return chat_service
+
+
 @app.post("/v1/chat/completions")
 async def send_conversation(request: Request, token=Depends(verify_token)):
+    """
+    发送对话
+    :param request: 请求入参
+    :param token: 访问令牌
+    :return: 对话结果
+    """
     access_token = None
-    if not token:
-        return JSONResponse({"error": "Not authenticated"}, status_code=401)
-    elif token.startswith("ey"):
+    if token and token.startswith("ey"):
         access_token = token
+
+    # 入参格式校验
     try:
         request_data = await request.json()
     except Exception:
         return JSONResponse({"error": "Invalid JSON body"}, status_code=400)
 
-    async def to_send_conversation(request_data):
-        chat_service = ChatService(request_data, access_token)
-        await chat_service.get_chat_requirements()
-        return chat_service
-
-    chat_service = await async_retry(to_send_conversation, request_data)
+    # 对话前先决条件准备
+    chat_service = await async_retry(to_send_conversation, request_data, access_token)
     chat_service.prepare_send_conversation()
+
+    # 发送对话
     stream = request_data.get("stream", False)
     if stream:
+        # 流式响应
         return StreamingResponse(await chat_service.send_conversation_for_stream(), media_type="text/event-stream")
     else:
+        # 非流式响应
         return JSONResponse(await chat_service.send_conversation(), media_type="application/json")
 
 
 if __name__ == "__main__":
     import uvicorn
-
     uvicorn.run(app, host="0.0.0.0", port=5005)
diff --git a/utils/authorization.py b/utils/authorization.py
index eb0eb0a..da447d4 100644
--- a/utils/authorization.py
+++ b/utils/authorization.py
@@ -1,15 +1,17 @@
-from fastapi import Depends
+from fastapi import Depends, HTTPException
 from fastapi.security import OAuth2PasswordBearer
 
 from utils.config import authorization_list
 
-oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token", auto_error=False)
 
 
 def verify_token(token: str = Depends(oauth2_scheme)):
+    if not token:
+        return None
     if not authorization_list or token in authorization_list:
         return token
     elif token.startswith("eyJhbGciOi"):
         return token
     else:
-        return False
+        raise HTTPException(status_code=401, detail="Not authenticated")