问题一：Failed to connect to gitlab.com port 443 after 21606 ms: Couldn't connect to server
问题描述：
在使用git进行推送gitlab仓库时，出现Failed to connect to gitlab.com port 443 after 21606 ms: Couldn't connect to server错误
问题解决：
先试着ping gitlab.com
修改DNS为自动获取
再次ping gitlab.com
git推送成功
问题二：添加.gitignore文件后，想要忽略已经追踪的文件需要删除该追踪文件才能正常忽略
如想忽略文件config.inc.php，该文件在之前的提交中是被追踪的，那么需要执行：
git rm --cached config.inc.php之后再进行提交，就不会再追踪了
如果是文件夹，则是：
git rm -r --cached directory_name问题三：error: RPC failed; curl 56 HTTP/2 stream 5 was reset
push时遇到错误：
error: RPC failed; curl 56 HTTP/2 stream 5 was reset
send-pack: unexpected disconnect while reading sideband packet
fatal: the remote end hung up unexpectedly
Everything up-to-date解决方法：
修改http.version
git config http.version HTTP/1.1