module Rack::Handler

def self.default
  # Guess.
  if ENV.include?("PHP_FCGI_CHILDREN")
    Rack::Handler::FastCGI
  elsif ENV.include?(REQUEST_METHOD)
    Rack::Handler::CGI
  elsif ENV.include?("RACK_HANDLER")
    self.get(ENV["RACK_HANDLER"])
  else
    pick SERVER_NAMES
  end
end