httpclient爬取数据报错“未将对象引用设置到对象的实例“

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先说一下过程：我爬的网址是http://xxxxxx.aspx,这个网页上面的一个按钮，点击之后获得数据，但是我得到这个按钮点击事件的url之后自己再次请求报错

解决方案:

添加 

  //http://xxxxxx.aspx是我爬取的网页地址

httpGet.setHeader("Referer", "http://xxxxxx.aspx");

然后请求解决问题