open.rb

require "open-uri"

options = {
  content_length_proc: ->(length) {
    if length && 0 < length
      puts "content_length = #{length}"
    end
  },
  progress_proc: ->(size) {
    puts "progress = #{size}"
  }
}

ARGV.each do |url|
  puts "--- #{url} ---"
  open(url, options).read
end