string(242) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=pom%E6%98%AF%E4%BB%80%E4%B9%88%E6%9D%90%E8%B4%A8%E7%9A%84%E7%AE%80%E7%A7%B0 => Failed to connect to 101.91.112.32 port 38162: Connection refused"
pom是什么材质的简称
