错误：
fail:Error Domain=NSURLErrorDomain Code=-1012 "(null)" UserInfo={NSErrorFailingURLKey=https://url, NSErrorFailingURLStringKey=https://url}
原因HTTPS请求引起的，没有配置安全证书。
解决方法：
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager.requestSerializer setValue:@"*/*" forHTTPHeaderField:@"Accept"];
[manager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
AFSecurityPolicy *policy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone];
//是否允许CA不信任的证书通过
policy.allowInvalidCertificates = YES;
//是否验证主机名
policy.validatesDomainName = NO;
manager.securityPolicy = policy;
