将邮递员请求转换为Objective-C时的状态码400

Question

我正在尝试将图片上传到API，然后使用结果。使用Postman时，一切都运行成功。当我使用导出功能将代码转换为Objective-C时，我尝试运行它，但我得到状态代码400（我的参数无效）。

这是邮递员的要求：

这是我自己的代码：

    // Get image name
    NSURL *refURL = [info valueForKey:UIImagePickerControllerReferenceURL];
    PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[refURL] options:nil];
    NSString *filename = [[result firstObject] filename];

    // Get image file path and append file name onto it
    NSData *imageData = UIImageJPEGRepresentation(image, 1.0);
    NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:filename];
    [imageData writeToFile:path atomically:YES];

    NSDictionary *headers = @{ @"content-type": @"multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW",
                               @"Content-Type": @"multipart/form-data",
                               @"Accept": @"application/json",
                               @"Authorization": @"Token 60f6be2a21bdf731d86a8817b440a1afba692fed",
                               @"Cache-Control": @"no-cache",
                               @"Postman-Token": @"7d262730-0c7d-66dc-bbbb-43f40dbfe8ce" };
    NSArray *parameters = @[ @{ @"name": @"task", @"value": @"dc9ef71a-b8a0-4a12-90fd-83d717cf887f" },
                             @{ @"name": @"image_file", @"fileName": path } ];
    NSString *boundary = @"----WebKitFormBoundary7MA4YWxkTrZu0gW";    

    NSError *error;
    NSMutableString *body = [NSMutableString string];
    for (NSDictionary *param in parameters) {
        [body appendFormat:@"--%@\r\n", boundary];
        if (param[@"fileName"]) {
            [body appendFormat:@"Content-Disposition:form-data; name=\"%@\"; filename=\"%@\"\r\n", param[@"name"], param[@"fileName"]];
            [body appendFormat:@"Content-Type: %@\r\n\r\n", param[@"contentType"]];
            [body appendFormat:@"%@", [NSString stringWithContentsOfFile:param[@"fileName"] encoding:NSASCIIStringEncoding error:&error]]; 

            if (error) {
                NSLog(@"%@", error);
            }
        } else {
            [body appendFormat:@"Content-Disposition:form-data; name=\"%@\"\r\n\r\n", param[@"name"]];
            [body appendFormat:@"%@", param[@"value"]];
        }
    }
    [body appendFormat:@"\r\n--%@--\r\n", boundary];
    NSData *postData = [body dataUsingEncoding:NSASCIIStringEncoding]; 

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://api.vize.ai/v1/classify/"]
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:10.0];
    [request setHTTPMethod:@"POST"];
    [request setAllHTTPHeaderFields:headers];
    [request setHTTPBody:postData];

    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                                completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                    if (error) {
                                                        NSLog(@"%@", error);
                                                    } else {
                                                        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                        NSLog(@"%@", httpResponse);
                                                    }
                                                }];
    [dataTask resume];

（这里没有显示，但我正在尝试使用用户从图像选择器中选择的图像。）为什么我得到状态代码400，我如何才能得到正确的结果？