Exception 加载网页时，如何避免watir webdriver超时错误导致程序终止？

我使用watirwebdriver自动化一些日常任务，但最近我完美的工作脚本在一开始就中止了。当我使用browser.goto“webpage”时，网页没有完全加载，因为页面底部有一个计数器，计数器服务似乎暂时关闭。有时会加载，有时不会。否则，我需要的所有html元素都已加载并可见，但页面无法完全加载，因此30秒后，我总是会收到tiemout错误，我的Ruby脚本终止时会显示以下错误消息：

/opt/ruby1.8/lib/ruby/1.8/timeout.rb:64:in `rbuf_fill': execution expired (Timeout::Error)
    from /opt/ruby1.8/lib/ruby/1.8/net/protocol.rb:134:in `rbuf_fill'
    from /opt/ruby1.8/lib/ruby/1.8/net/protocol.rb:116:in `readuntil'
    from /opt/ruby1.8/lib/ruby/1.8/net/protocol.rb:126:in `readline'
    from /opt/ruby1.8/lib/ruby/1.8/net/http.rb:2028:in `read_status_line'
    from /opt/ruby1.8/lib/ruby/1.8/net/http.rb:2017:in `read_new'
    from /opt/ruby1.8/lib/ruby/1.8/net/http.rb:1051:in `request'
    from /opt/ruby1.8/lib/ruby/1.8/net/http.rb:1037:in `request'
    from /opt/ruby1.8/lib/ruby/1.8/net/http.rb:543:in `start'
    from /opt/ruby1.8/lib/ruby/1.8/net/http.rb:1035:in `request'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/http/default.rb:82:in `response_for'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/http/default.rb:38:in `request'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/http/common.rb:40:in `call'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/bridge.rb:598:in `raw_execute'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/bridge.rb:576:in `execute'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/bridge.rb:99:in `get'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/common/navigation.rb:14:in `to'
    from /opt/ruby1.8/lib/ruby/gems/1.8/gems/watir-webdriver-0.6.1/lib/watir-webdriver/browser.rb:63:in `goto'

有没有办法避免程序终止和处理未完全加载的页面？我的意思是，如果可能的话，任何超时异常处理，最重要的是我的Ruby脚本不终止地继续。我尝试过这个，但没有成功，因为我是ruby程序员只有3天：

begin
  browser.goto "http://example.com"
rescue Watir::Exception::NavigationException => e #catch the Exception
  puts "Page did not load: #{e}" 
  # program continues from here 
end

---

尝试营救

Timeout:：Error

，而不是

Watir:：Exception:：NavigationException