string(263) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ad10%E5%8E%9F%E7%90%86%E5%9B%BE%E7%94%9F%E6%88%90pdf%E5%90%8E%E5%AD%97%E6%AF%8D%E9%87%8D%E5%8F%A0 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
ad10原理图生成pdf后字母重叠
