string(273) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=word%E9%A1%B5%E7%A0%81%E4%BB%8E%E6%8C%87%E5%AE%9A%E9%A1%B5%E5%BC%80%E5%A7%8B%2C%E6%8C%87%E5%AE%9A%E9%A1%B5%E7%BB%93%E6%9D%9F => Received HTTP code 403 from proxy after CONNECT"
word页码从指定页开始,指定页结束
