string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%92%8B%E6%A0%B7%E6%B8%85%E7%90%86%E7%94%B5%E8%84%91%E5%86%85%E5%AD%98 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
咋样清理电脑内存
