knitr - R produces "unsupported URL scheme" error when getting data from https sites

Question

R version 3.0.1 (2013-05-16) for Windows 8 knitr version 1.5 Rstudio 0.97.551

I am using knitr to do the markdown of my R code. As part of my analysis I downloaded various data sets from the web, knitr is totally fine with getting data from http sites but from https ones where it generates an unsupported URL scheme message. I know when using the download.file function on a mac the method parameter has to be set to curl to get data from an https however this doesn't help when using knitr.

What do I need to do so that knitr will gather data from Https websites?

Edit: Here is the code chunk that returns an error in Knitr but when run through R works without error.

```{r}
fileurl <- "https://dl.dropbox.com/u/7710864/data/csv_hid/ss06hid.csv"
download.file(fileurl, destfile = "C:/Users/xxx/yyy")
```

Answer 1

You could use https with download.file() function by passing "curl" to method as :

download.file(url,destination,method="curl")