wget and open-uri

I have a question about open-uri in site of my kanshipin.net. And my configuration info listed below: os:Solar System ruby:1.9.1p0 ror:2.3.2 when i tried to visit the url of http://api.bd.joy.cn/rest?parameters…, the wget can get correct result but the open-uri get http error of 404

The service api.bd.joy.cn used url-rewrite tech to handle request,but why wget can works well ,open-uri can not.

I need you help !