Fix cookie

daemon.py

@@ -10542,6 +10542,10 @@ class PubServer(BaseHTTPRequestHandler):
             # The file has not changed
             self._304()
             return True
+        t = os.path.getmtime(avatarFilename)
+        lastModifiedTime = datetime.datetime.fromtimestamp(t)
+        lastModifiedTimeStr = modifiedTime.strftime("%Y-%m-%dT%H:%M:%SZ")
+
         mediaImageType = getImageMimeType(avatarFile)
         with open(avatarFilename, 'rb') as avFile:
             mediaBinary = avFile.read()