# File lib/routing_filter/adapters/rails_2.rb, line 60
  def extract_request_environment(request)
    extract_request_environment_without_host(request).tap do |env|
      env.merge! :host => request.host,
                 :port => request.port,
                 :host_with_port => request.host_with_port,
                 :domain => request.domain,
                 :subdomain => request.subdomains.first
    end
  end