How to install R packages via proxy [user + password]

Question

I need authentication to use internet, say these are my variables:

1. Proxy : 1ncproxy1
2. Port : 80
3. Loggin : MyLoGiN
4. Pass : MyPaSs
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Answer 1

I tried to install swirl package, and had the same problem - proxy with authorisation.

After some experiments i found decision. May be my answer will help for anybody. On Windows 7 :

1. set 1 or more (if ou need) env variables http_proxy (https_proxy and ftp_proxy if you need) (If you dont know how - read there http://www.computerhope.com/issues/ch000549.htm ) Its look like that env variables for proxy

2. format http_proxy="http://Proxyusername:ProxyUserPassw@proxyServName:ProxyPort"

3. Use '@' instead of %40

4. In RStudio Tools->Global Options->Packages release check box "Use Internet Explorer library /proxy for HTTP"