Я пытаюсь загрузить фотографию на свой веб-сервер черезAFHTTPRequestOperation, Вот мойAFHTTPSessionManager, Все http-запросы через этотmanager работает отлично.

- (AFHTTPSessionManager *)manager
{
    if (_manager == nil) {
        _manager = [[AFHTTPSessionManager alloc] initWithBaseURL:[NSURL URLWithString:@"https://my.domain.com/api/v2"]];
        [_manager.requestSerializer setAuthorizationHeaderFieldWithUsername:@"username" password:@"password"];

        AFSecurityPolicy *policy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone];
        policy.allowInvalidCertificates = YES;
        _manager.securityPolicy = policy;
    }
    return _manager;
}

Но когда я пытаюсь загрузить фотографию с обработкой прогресса:

- (void)photoSend:(UIImage *)photo
          toUsers:(NSArray *)users
       completion:(CompletionHandler)completion
         progress:(ProgressionHandler)progress
{
    NSDictionary *params = @{
                             @"token":self.token,
                             @"to_usernames":[users componentsJoinedByString:@","],
                             };

    NSString *urlString = [[NSURL URLWithString:@"photo/send" relativeToURL:self.manager.baseURL] absoluteString];
    NSMutableURLRequest *request = [self.manager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:urlString parameters:params constructingBodyWithBlock:^(id <AFMultipartFormData> formData)
                                    {
                                        [formData appendPartWithFileData:UIImageJPEGRepresentation(photo,0.8)
                                                                    name:@"photo"
                                                                fileName:@"image.jpg"
                                                                mimeType:@"image/jpg"];
                                    } error:nil];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    operation.responseSerializer = [AFJSONResponseSerializer serializer];
    // Following 2 lines does not make sense. Http headers contains auth data without this code
    //NSURLCredential *credential = [NSURLCredential credentialWithUser:@"login" password:@"password" persistence:NSURLCredentialPersistenceNone];
    //[operation setCredential:credential];

    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        progress(totalBytesWritten*1.0/totalBytesExpectedToWrite);
    }];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        completion(operation.response, responseObject, operation.error);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        completion(operation.response, nil, error);
    }];

    [self.manager.operationQueue addOperation:operation];
}

Я получаю следующую ошибку:

Ошибка домена = NSURLErrorDomain Code = -1012 «Операция не может быть завершена. (NSURLErrorDomain ошибка -1012.)» UserInfo = 0x994ff20 {NSErrorFailingURLKey =https://my.domain.com/v2/photo/send, NSErrorFailingURLStringKey =https://my.domain.com/v2/photo/send}