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# brew install nginx
sudo ln -s /usr/local/opt/nginx/homebrew.mxcl.nginx.plist /Library/LaunchDaemons/
sudo chown root:wheel /usr/local/opt/nginx/homebrew.mxcl.nginx.plist
sudo launchctl load /Library/LaunchDaemons/homebrew.mxcl.nginx.plist

# Why do you need sudo?
# If you want nginx to be able to bind to port 80, it will need superuser privileges