R - Write a HTML file from URL/HTML Object/HTML Response

I want to save a HTML file using a URL from R. I have tried to save the response object(s) after using GET and read_html functions of httr and rvest packages respectively, on the URL of the website, I want to save the HTML of. But that didn't work out to save the actual contents of the website.

url = "https:\\facebook.com"
get_object = httr::GET(url); save(get_object, "file.html")
html_object = rvest::read_html(url); save(html_object, "file.html")

Neither of these work to save the correct output of the actual website in the HTML file.