string(241) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=raw%E6%A0%BC%E5%BC%8F%E7%85%A7%E7%89%87%E5%A4%84%E7%90%86%E6%8A%80%E6%B3%95 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
raw格式照片处理技法
