To proxy or not to proxy, that's the question

connection-quality.rb

class Connection

  require 'net/http'

  TEST_HOST = 'www.example.com'
  TEST_PORT = 80
  TEST_PATH = '/index.html'

  # yields either one of the supplied proxy or :unrestricted (no proxy) or :restricted (nothing worked)
  def self.quality? *proxies

    if request
      :unrestricted
    else
  
      proxies.each do |proxy|
        host, port = proxy.split ':'
        return proxy if request host, port
      end
  
      :restricted
  
    end
    
  end
  
  protected
  
  def self.request host = nil, port = nil
    
    opt = { :open_timeout => 1, :read_timeout => 1 }
    
    !(Net::HTTP.start(TEST_HOST, TEST_PORT, host, port, nil, nil, opt) do |http|
      http.head(TEST_PATH)
    end rescue nil).nil?
    
  end

end