string(257) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BB%8F%E8%B4%B8%E5%B1%80%E4%B8%BB%E8%A6%81%E6%98%AF%E5%81%9A%E4%BB%80%E4%B9%88%E5%B7%A5%E4%BD%9C%E7%9A%84 => Received HTTP code 403 from proxy after CONNECT"
经贸局主要是做什么工作的
