Can't open download.list

When I use get_map(), it always give me this error.

Error in download.file(url, destfile = tmp, quiet = !messaging, mode = "wb") :
can't open URL'http://maps.googleapis.com/maps/api/staticmap?center=Tokyo&zoom=10&size=640x640&scale=2&maptype=terrain&language=en-EN&sensor=false'
Addition: Warning message:
In download.file(url, destfile = tmp, quiet = !messaging, mode = "wb") :
URL 'http://maps.googleapis.com/maps/api/staticmap?center=Tokyo&zoom=10&size=640x640&scale=2&maptype=terrain&language=en-EN&sensor=false': status was 'Couldn't connect to server'

But I can open the URL in chromosome browser.

```r
reprex::reprex({
library(ggmap)
map.tokyo <- get_map("Tokyo")

}, si = TRUE)
```