class HTTPClient::SessionManager

def get_cached_session(site)
  if Thread.current[:HTTPClient_AcquireNewConnection]
    return nil
  end
  @sess_pool_mutex.synchronize do
    now = Time.now
    if now > @sess_pool_last_checked + @keep_alive_timeout
      scrub_cached_session(now)
      @sess_pool_last_checked = now
    end
    if pool = @sess_pool[site]
      pool.each_with_index do |sess, idx|
        if valid_session?(sess, now)
          return pool.slice!(idx)
        end
      end
    end
  end
  nil
end