Check for URL existence

Taken from https://stackoverflow.com/questions/52911812/check-if-url-exists-in-r.

Usage

valid_url(url_in, t = 2)

Arguments

url_in

String of URL to test

t

Time out

Examples

urls <- c(
  "http://www.amazon.com", "http://this.isafakelink.biz",
  "https://stackoverflow.com", "http://localhost:80")
sapply(urls, valid_url)
#>       http://www.amazon.com http://this.isafakelink.biz 
#>                        TRUE                       FALSE 
#>   https://stackoverflow.com         http://localhost:80 
#>                        TRUE                       FALSE