看 日志： 七牛

1478510589.049832 resp ===== (null)
1478510589.521666 info ===== <QNResponseInfo= id: F5E576FB-2AFD-441C-A3EC-4A046276713B, ver: 7.1.1, status: 404, requestId: ikcAAGN5BCqMuYQU, xlog: IO/404, xvia: (null), host: http ip: 106.38.227.27 duration: 13.120001 s time: 1478510589 error: Error Domain=qiniu.com Code=404 "(null)" UserInfo={error=no such domain}>
1478510589.522093 resp ===== (null)

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改 七牛， 美国

+ (instancetype)zoneNa {
    static QNZone *zNa = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        zNa = [QNZone createWithHost:@"upload-na0.qiniu.com" backupHost:@"up-na0.qiniu.com" ip1:@"23.236.102.2" ip2:@"23.236.102.3"];
    });
    return zNa;
}