Rvest Function error (type, msg, asError = TRUE): Failed to resolve host: google.com; Host not found

I am trying to use the rvest package (downloaded from CRAN) to clear certain content from the site, but I got the error:

library(rvest)    
html("http://google.com")

      

        
        
        
      

    

Here's the result:

Function error (type, msg, asError = TRUE): Could not resolve host: google.com; Host not found

I tried Sys.setenv (http_proxy = "webproxy: port") or installed files. / Renviron and a few other tricks I found on stackoverflow but none seem to work.