string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%A5%E4%B8%8B%E8%BF%99%E4%BA%9B%E6%8E%A8%E5%B9%BF%E6%96%B9%E5%BC%8F%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF => Failed to connect to 14.116.215.7 port 38225: Connection refused"
以下这些推广方式正确的是
