diff --git a/app/core/security.py b/app/core/security.py
index 802e837..a99e69f 100644
--- a/app/core/security.py
+++ b/app/core/security.py
@@ -1,4 +1,4 @@
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from typing import Optional, Union, Any
 
 from jose import jwt
@@ -8,6 +8,10 @@ from app.core.config import settings
 pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
 
 
+def _utc_now() -> datetime:
+    return datetime.now(timezone.utc)
+
+
 def create_access_token(
     subject: Union[str, Any], expires_delta: Optional[timedelta] = None
 ) -> str:
@@ -22,9 +26,9 @@ def create_access_token(
         JWT token 字符串
     """
     if expires_delta:
-        expire = datetime.now() + expires_delta
+        expire = _utc_now() + expires_delta
     else:
-        expire = datetime.now() + timedelta(
+        expire = _utc_now() + timedelta(
             minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
         )
 
@@ -32,7 +36,7 @@ def create_access_token(
         "exp": expire,
         "sub": str(subject),
         "type": "access",
-        "iat": datetime.now(),
+        "iat": _utc_now(),
     }
     encoded_jwt = jwt.encode(
         to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
@@ -50,13 +54,13 @@ def create_refresh_token(subject: Union[str, Any]) -> str:
     Returns:
         JWT refresh token 字符串
     """
-    expire = datetime.now() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
+    expire = _utc_now() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
 
     to_encode = {
         "exp": expire,
         "sub": str(subject),
         "type": "refresh",
-        "iat": datetime.now(),
+        "iat": _utc_now(),
     }
     encoded_jwt = jwt.encode(
         to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
diff --git a/app/infra/audit/middleware.py b/app/infra/audit/middleware.py
index eb94fe8..d8f1e3e 100644
--- a/app/infra/audit/middleware.py
+++ b/app/infra/audit/middleware.py
@@ -61,11 +61,20 @@ class AuditMiddleware(BaseHTTPMiddleware):
         "/api/v1/openproject/",
         "/openproject/",
     }
+    EXCLUDED_PATH_PREFIXES = (
+    )
 
     async def dispatch(self, request: Request, call_next: Callable) -> Response:
         # 提取开始时间
         start_time = time.time()
 
+        # 流式 Copilot 请求前置排除，避免读取/改写 body 影响 SSE 生命周期
+        if self._is_excluded_path(request.url.path):
+            response = await call_next(request)
+            process_time = time.time() - start_time
+            response.headers["X-Process-Time"] = str(process_time)
+            return response
+
         # 1. 预判是否需要读取Body (针对写操作)
         # 注意：我们暂时移除早期的 return，因为需要等待路由匹配后才能检查 Tag
         should_capture_body = request.method in ["POST", "PUT", "PATCH"]
@@ -74,13 +83,24 @@ class AuditMiddleware(BaseHTTPMiddleware):
         if should_capture_body:
             try:
                 # 注意：读取 body 后需要重新设置，避免影响后续处理
+                original_receive = request._receive
                 body = await request.body()
                 if body:
                     request_data = json.loads(body.decode())
 
-                # 重新构造请求以供后续使用
+                # 重新构造请求以供后续使用：仅回放一次，后续回落原始 receive
+                body_sent = False
+
                 async def receive():
-                    return {"type": "http.request", "body": body}
+                    nonlocal body_sent
+                    if not body_sent:
+                        body_sent = True
+                        return {
+                            "type": "http.request",
+                            "body": body,
+                            "more_body": False,
+                        }
+                    return await original_receive()
 
                 request._receive = receive
             except Exception as e:
@@ -90,7 +110,7 @@ class AuditMiddleware(BaseHTTPMiddleware):
         response = await call_next(request)
 
         # 3. 决定是否审计
-        if request.url.path in self.EXCLUDED_PATHS:
+        if self._is_excluded_path(request.url.path):
             process_time = time.time() - start_time
             response.headers["X-Process-Time"] = str(process_time)
             return response
@@ -150,6 +170,11 @@ class AuditMiddleware(BaseHTTPMiddleware):
 
         return response
 
+    def _is_excluded_path(self, path: str) -> bool:
+        if path in self.EXCLUDED_PATHS:
+            return True
+        return any(path.startswith(prefix) for prefix in self.EXCLUDED_PATH_PREFIXES)
+
     def _resolve_project_id(self, request: Request) -> UUID | None:
         project_header = request.headers.get("X-Project-Id")
         if not project_header: