How do I open a web page and write it to a file in ruby?

require 'open-uri'

open("file_to_write.html", "wb") do |file|
  URI.open("http://www.example.com/") do |uri|
     file.write(uri.read)
  end
end

Note: In Ruby < 2.5 you must use open(url) instead of URI.open(url). See https://bugs.ruby-lang.org/issues/15893

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