Disable static directory. Ref https://github.com/GNS3/gns3-gui/issues/2558.

gns3server/web/web_server.py

@@ -278,11 +278,11 @@ class WebServer:
             m.port_manager = PortManager.instance()
 
         # adding static route
-        self._app.router.add_static(
-            '/static/',
-            path=get_static_dir(),
-            name='static'
-        )
+        #self._app.router.add_static(
+        #    '/static/',
+        #    path=get_static_dir(),
+        #    name='static'
+        #)
 
         log.info("Starting server on {}:{}".format(self._host, self._port))