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cat > ~/.bash_profile << EOF
function proxy_on() {
    export http_proxy=http://127.0.0.1:7890
    export https_proxy=\$http_proxy
    echo -e "终端代理已开启。"
}

function proxy_off(){
    unset http_proxy https_proxy
    echo -e "终端代理已关闭。"
}
EOF

source ~/.bash_profile

proxy_on

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fatal: unable to access 'https://github.com/DowneyFlyfan/downeyflyfan.github.io/': LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443

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networksetup -setv6off Wi-Fi