diff --git a/out_service/cd.py b/out_service/cd.py
index f8aee930..b7bc5bdd 100644
--- a/out_service/cd.py
+++ b/out_service/cd.py
@@ -122,7 +122,17 @@ class JSONRequestHandler(BaseHTTPRequestHandler):
             
         res = handle_bytes(resp)
         if isinstance(res, str):
-            self.error(res)
+            if res == "数据头不正确":
+                sc, resp = connect_and_send()
+                if sc is None or resp is None:
+                    return
+                res = handle_bytes(resp)
+                if isinstance(res, str):
+                    self.error(res)
+                else:
+                    self.ok(res)
+            else:
+                self.error(res)
         else:
             self.ok(res)