Typhoeus example.

gistfile1.rb

require 'typhoeus'

class ImageDownloader

  # Returns an array of images at the given `urls`.
  # Each element is either a StringIO representation of an image
  # or nil if the image could not be downloaded for any reason.
  #
  # Params:
  # urls     - an array of URLs pointing to images
  def get(urls, options = {})
    options = defaults.merge options
    results = Array.new urls.length
    hydra = Typhoeus::Hydra.new
    urls.each_with_index do |url, index|
      request = Typhoeus::Request.new url, options
      request.on_complete do |response|
        results[index] = response.success? ? StringIO.new(response.body) : nil
      end
      hydra.queue request
    end
    hydra.run
    results
  end

  private

  def defaults
    {timeout: 10000}  # 10s
  end

end