memo

restore_shorten_uri.rb

require 'net/https'

def restore_shorten_uri(uri)
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = uri.scheme == 'https'
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  http.start do |h|
    res = h.head(uri.path)
    loc = res['Location']
    URI.regexp =~ loc ? URI.parse(loc) : uri
  end
end