一切正常，除了heroku日志

[清羽Victor]

2021-05-13T15:48:13.995684+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=echou114514.herokuapp.com request_id=fc7ed087-4042-4980-a2a9-1e0931de1319 fwd="155.94.197.59" dyno=web.1 connect=1ms service=3ms status=404 bytes=146 protocol=https
2021-05-13T15:48:13.994977+00:00 app[web.1]: [GIN] 2021/05/13 - 15:48:13 |�[97;43m 404 �[0m| 140ns | 155.94.197.59 |�[97;44m �[0m GET /favicon.ico

好像是模式的问题唉