string(239) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8D%96%E5%AE%B6%E7%9A%84%E5%9F%BA%E6%9C%AC%E4%B9%89%E5%8A%A1%E6%98%AF%E4%BB%80%E4%B9%88 => Received HTTP code 403 from proxy after CONNECT"
卖家的基本义务是什么
