Unsupported URL scheme error, how to use “https” CRAN mirrors in R 3.2.4?

When I run install.packages("packagename") I get prompted to choose a CRAN mirror.

If I choose a https mirror the following error message comes up:
```
unsupported URL scheme 
```
If I choose a http mirror (choice 22), installation goes on without this warning.

How do I make install.packages() support https mirrors?

I'm using a 32 bit version of R if that is of any importance.

Try this: install.packages("packagename", repos="http://cran.cnr.berkeley.edu")

来源：https://stackoverflow.com/questions/36550221/unsupported-url-scheme-error-how-to-use-https-cran-mirrors-in-r-3-2-4

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