Solution for R error: "unsupported URL scheme"

gistfile1.txt

# Following produces the error
> install.packages("magrittr")
Installing package into ‘/home/josh/R/x86_64-redhat-linux-gnu-library/3.2’
(as ‘lib’ is unspecified)
--- Please select a CRAN mirror for use in this session ---
Error in download.file(url, destfile = f, quiet = TRUE) : 
  unsupported URL scheme
HTTPS CRAN mirror 

. . .
Warning: unable to access index for repository https://cran.revolutionanalytics.com/src/contrib:
  unsupported URL scheme
Warning message:
package ‘magrittr’ is not available (for R version 3.2.3) 

# Following fixes that problem
> options(download.file.method = "wget")
> install.packages("magrittr")
Installing package into ‘/home/josh/R/x86_64-redhat-linux-gnu-library/3.2’
(as ‘lib’ is unspecified)
--2016-05-18 14:59:53--  https://cran.revolu