string(257) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BF%9D%E8%AF%81%E7%9A%84%E6%B3%95%E5%BE%8B%E6%95%88%E5%8A%9B%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
保证的法律效力是什么
