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Using `npm` behind a proxy

To permanently set the configuration we can do this.
 npm config set proxy http://proxy.company.com:8080
 npm config set https-proxy http://proxy.company.com:8080
If you need to specify credentials, they can be passed in the url using the following syntax.
 http://user_name:password@proxy.company.com:8080
To Redirect traffic over proxy.
 npm --https-proxy=http://proxy.company.com:8080 -g install npmbox
 npm --https-proxy=http://proxy.company.com:8080 -g install kafka-node
More Details.
 http://wil.boayue.com/blog/2013/06/14/using-npm-behind-a-proxy/
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