diff --git a/deploy/convert_server.py b/deploy/convert_server.py
index 14bfed6..9bc49cb 100755
--- a/deploy/convert_server.py
+++ b/deploy/convert_server.py
@@ -311,9 +311,9 @@ class Handler(BaseHTTPRequestHandler):
             json={"filename": filename, "data": "\\x" + file_data.hex()},
             timeout=60
         )
-        self._send_cors()
         if resp.status_code == 200:
             self.send_response(200)
+            self._send_cors()
             self.send_header("Content-Type", "application/json; charset=utf-8")
             self.end_headers()
             self.wfile.write(resp.content)