有时，当您在公司或大学网络后面时，您可能
需要设置HTTP / HTTPS代理设置才能访问Internet。在linux上设置代理很简单，你只需要导出环境变量，就可以添加到你的shell配置文件中。

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export http_proxy=http://<ip>:<port>
export https_proxy=$http_proxy

但是，当您尝试使用sudo运行包管理器时，这些变量将不会传递到root。当您必须使用AUR存储库并且它不会在root中构建软件包并且当您尝试使用非特权用户运行它时，这变得特别烦人，它无法通过pacman下载依赖项。有两种方法可以解决这个问题。

1) Pass on environment variables to root

• Run to following command to edit sudoers file

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$ sudo visudo

• add the following line

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Defaults env_keep += "https_proxy http_proxy"

这样，$ https_proxy和$ http_proxy将被sudo传递给root。
Also make sure you have set environment variables for current user. If not then you can add it by editing .bashrc if you use bash or ~/.config/fish/config.fish if you use fish like me.。

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export http_proxy=http://<ip>:<port>
export https_proxy=$http_proxy

2) Set proxy for pacman

You also directly set proxy for pacman by editing /etc/pacman.conf

• open pacman config file by

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$ sudo nano nano /etc/pacman.conf

uncomment XferCommand so that it looks like

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XferCommand = /usr/bin/wget --passive-ftp --proxy=on -c -O %o %u

save it and then open /etc/wgetrc

and uncommand the following lines so that it looks like

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https_proxy = http://<ip>:<port>
http_proxy = http://<ip>:<port>
use_proxy = on

This should make pacman run via sudo.

For other applications like firefox you can set proxy directly through

Preferences > Advanced > Network > Settings

and for chrome / chromium you’d need to pass argument to use proxy like

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~$ chromium --http-proxy=<ip>:<port>

Most of the things which need internet and work over http/https proxy should work now.

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