NSURLSessionDataTask failed with error code -999

Question

I am using NSUrlSession for calling backend APIs. Sometimes the APIs are working but sometimes i am getting the issues like

HTTP load failed (error code: -999), HTTP load failed (error code: -1200)

Refer below :- Screenshot from Xcode logs.

I have researched regarding it and the possible solutions suggested is to use App Transport Security Settings and I am already using it.

Here is the screenshot from info.plist file of my project.

Here below is the code i am using :-

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request uploadProgress:^(NSProgress * _Nonnull uploadProgress) {
} downloadProgress:^(NSProgress * _Nonnull downloadProgress) {

} completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
    NSInteger statusCode = [httpResponse statusCode];
    completionBlock();
}];

[dataTask resume];

So not able to figure out what exactly causing NSURLSessionDataTask to fail. Even completion block is not called.

Any suggestions?

Thanks,

Did you modified the correct `info.plist` ? please check once. I had made the same mistake yesterday. — Ratul Sharker, Apr 09 '18 at 07:21
Yes its in correct plist file. So kinda stuck with this issue. :( — Awesome.Apple, Apr 09 '18 at 08:02
@Awesome.Apple Can you give a debug repo with the link you used? — trungduc, Apr 09 '18 at 10:37
@Awesome.Apple You need to create a new project. Reproduce problem in this project. Upload it to Github or somewhere after that give us link to download this project. I think it will be easier and faster to help you. — trungduc, Apr 09 '18 at 11:25
Hi I have created a new project and its working in it. But not in my main project @trungduc — Awesome.Apple, Apr 09 '18 at 12:34
@Awesome.Apple Seem like problem not related to above code. You should provide more information. — trungduc, Apr 09 '18 at 12:46
@Awesome.Apple I have faced a similar issue and it was caused by memory leak I had - the task was failing because it didn't have enough memory to allocate to perform — Krzysztof Skrzynecki, Dec 17 '19 at 13:35

score 3 · Answer 1 · answered Apr 09 '18 at 09:36

3

Error code -999 is cancelled request, as you're using a wrapper for NSURLSession, probably you can't see the correct message.

Anyways, you're instantiating 3 new objects: configuration, manager and data task. None of them has a strong reference in another object (a UIViewController for instance), so when you call [dataTask resume], ARC is already removing the reference of your object, because in the concept of sync code, this code is done.

In summary, this is the correct behaviour, to fix that, try to create a strong reference of AFURLSessionManager in your class and everything will be ok.

answered Apr 09 '18 at 09:36

bguidolim

367
2
9

And how to have a strong reference of AFURLSessionManager? – Awesome.Apple Apr 09 '18 at 09:57
You mean trying declaring it globally? – Awesome.Apple Apr 09 '18 at 10:01
Usually creating a property in that class you're executing this code. – bguidolim Apr 09 '18 at 10:02
Tried creating property :- @property (nonatomic, strong) AFURLSessionManager *manager; – Awesome.Apple Apr 09 '18 at 10:07
@property (nonatomic, strong) NSURLSessionDataTask *dataTask; – Awesome.Apple Apr 09 '18 at 10:07
But still same issue – Awesome.Apple Apr 09 '18 at 10:07
Can you provide a sample project? – bguidolim Apr 09 '18 at 11:23
I have implemented Chat third party sdk and also Project size is heavy. How i would be able to provide demo? – Awesome.Apple Apr 09 '18 at 13:03
@Awesome.Apple you can create a new project reproducing the same issue and publish a zip file on dropbox or something. – bguidolim Apr 09 '18 at 17:10

NSURLSessionDataTask failed with error code -999

1 Answers1