如题，retrofit2 下载图片，请求失败，返回到onFailure！什么原因？该怎么解决？
求大神解答。。急！急！急！在线等！
09-28 15:58:56.917 24976-25267/com.example.tenrice D/libc-netbsd: [getaddrinfo]: hostname=yao.gcn99.com; servname=(null); cache_mode=(null), netid=0; mark=0
09-28 15:58:56.917 24976-25267/com.example.tenrice D/libc-netbsd: [getaddrinfo]: ai_addrlen=0; ai_canonname=(null); ai_flags=4; ai_family=0
09-28 15:58:56.917 24976-25267/com.example.tenrice D/libc-netbsd: [getaddrinfo]: hostname=yao.gcn99.com; servname=(null); cache_mode=(null), netid=0; mark=0
09-28 15:58:56.917 24976-25267/com.example.tenrice D/libc-netbsd: [getaddrinfo]: ai_addrlen=0; ai_canonname=(null); ai_flags=1024; ai_family=0
09-28 15:58:56.926 24976-25267/com.example.tenrice D/libc-netbsd: getaddrinfo: yao.gcn99.com get result from proxy >>
09-28 15:58:56.926 24976-25267/com.example.tenrice I/System.out: propertyValue:false
09-28 15:58:56.927 24976-25267/com.example.tenrice I/System.out: entering allowSendingEmail
09-28 15:58:56.927 24976-25267/com.example.tenrice I/System.out: [CDS]connect[yao.gcn99.com/120.26.62.253:80] tm:10