caso de pau para criar o react app via npm
http://wil.boayue.com/blog/2013/06/14/using-npm-behind-a-proxy/
On a recent assignment, I needed to install npm behind a corporate proxy. I had already set the environment variables HTTP_PROXY and HTTPS_PROXY. Other command line utilities, like ruby gems, recognized these environment variables. Npm did not.
After some googling, I found the following way to configure the proxy for npm.
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.