string(255) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ad16%E5%8E%9F%E7%90%86%E5%9B%BE%E7%94%9F%E6%88%90pdf%E4%B8%AD%E6%96%87%E6%B2%A1%E4%BA%86 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
ad16原理图生成pdf中文没了
