string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BA%A2%E5%AE%9D%E4%B9%A6%E9%85%8D%E5%A5%97%E9%A2%98%E6%9C%89%E5%BF%85%E8%A6%81%E5%81%9A%E5%90%97 => Failed to connect to 14.116.215.7 port 38230: Connection refused"
红宝书配套题有必要做吗
