http.rb

def fetch_with_limits(uri_str, limit = 10)
  raise ArgumentError, 'HTTP redirect too deep' if limit == 0
  
  url = URI.parse(uri_str)
  req = Net::HTTP::Post.new(url.path)
  req.range = (0..1000)
  response = Net::HTTP.new(url.host, url.port).start {|http| http.request(req) }
  case response
  when Net::HTTPSuccess     then response
  when Net::HTTPRedirection then fetch(response['location'], limit - 1)
  else
    response.error!
  end
end