向管理员反馈 2 个问题：learnku 回复帖子返回 500；Composer 镜像返回 502

问题1：

刚刚在回复帖子时候发现提交不了，通过Chrome控制台发现learnku返回了500错误

问题2

composer报错信息如下：

⇒  composer install --no-dev
Loading composer repositories with package information
Installing dependencies from lock file
Package operations: 0 installs, 2 updates, 0 removals
  - Updating laravel/framework (v5.8.16 => v5.8.17): Downloading (failed)
Downloading (failed)
Downloading (failed)
 Failed, trying the next URL (502: The "https://dl.laravel-china.org/laravel/framework/33c04dd2a431adeeb49926a4f2b20590cc033ca2.zip" file could not be downloaded (HTTP/1.1 502 Bad Gateway))Downloading (100%)
  - Updating tightenco/collect (v5.8.16 => v5.8.17): Downloading (100%)