AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
manager.responseSerializer.acceptableContentTypes=[NSSet setWithObject:@"application/json"];
[manager POST:stringUrl parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:imageData name:@"imageFile"fileName:@"avatar.jpg"mimeType:@"image/jpg/file/png"];
} success:^(AFHTTPRequestOperation *operation, NSData * responseObject) {
    [MBProgressHUD stopMBProgressHUD:self.view];
    NSData *doubi = responseObject;
    NSDictionary * dataDic = [NSJSONSerialization JSONObjectWithData:doubi options:NSJSONReadingAllowFragments error:nil];
    
    // 成功 返回一个图片Url地址
   
        
   
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    
}];

NSURLErrorCannotParseResponse =             -1017,

可能是返回数据的类型有问题。