> So you are saying that if you enter the url directly in the browser
> you get one result, but if you use rails to redirect to exactly the
> same url then you get a different effect?
  yes,that is right.
> What happens if you just put a link to that url on your web page and
> click it?
  i appreciate this debug way.i have made a link and click it on my 
page,the result is right,a popup window appears. i think i don't need to 
attach an image to show it.Colin,it seems redirect_to method doesn't 
work well with facebook url.

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