string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%A5%E4%B8%8B%E5%93%AA%E4%BA%9B%E5%B1%9E%E4%BA%8E%E5%8D%96%E5%AE%B6%E5%BA%94%E5%BD%93%E5%B1%A5%E8%A1%8C%E7%9A%84%E4%B9%89%E5%8A%A1 => Received HTTP code 403 from proxy after CONNECT"
以下哪些属于卖家应当履行的义务
