NSURLSession and Connection terrible memory leaks

Question

every time i make a request to my web server via NSURLSession/Connection it leaks! To be honest it is not much but if you have to make a couple hundreds or thousands of calls this gets nasty.

I have been on this for about a week now. I have tried everything. NO cache , little cache, setting everything on nil after the call is done(which is unnecessary), using datatask for sessions or just connection with requests. Every time i get a little more memory allocated and i have not found a way to solve this problem.

So i set up a little testApp:

#import "ViewController.h"

@interface ViewController ()
@property NSString *param;
@property NSURL * url;
@property NSURLConnection *test;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];



    self.param = [NSString stringWithFormat:@"hi"];
    self.url = [[NSURL         alloc]initWithString:@"http://127.0.0.1/xmlfile.php"];
    for (int i = 0; i<20000; i++){
        [self connect:self.param url:self.url];
    }
    NSLog(@"I AM DONE!");
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any   resources that can be recreated.
}


- (NSData *)connect:(NSString*)param url:(NSURL*)url{
    self.test = [[NSURLConnection alloc]initWithRequest:nil  delegate:self];
    [[NSURLCache sharedURLCache] removeAllCachedResponses];
       return nil;
}

@end

i would love to add images of the memory usage but i am too new. so just go here: 5k:iterations http://i59.tinypic.com/123tts2.png 20k: http://i59.tinypic.com/1zzqsrk.png

I have heard that this could be a problem with ios8.

Please help!

I am open for everything and would be happy if someone could prove me wrong and show me the right way. Thanks a bunch

Matt Gibson Matt Gibson · Accepted Answer · 2015-03-27T18:33:29

You're never actually turning your URL into a request and giving it to the NSURLConnection. Because of that, the connection will never complete, and its memory will stay allocated. You'll find a world of difference with the above code if you add this to your connect:url: method:

NSURLRequest* request = [[NSURLRequest alloc] initWithURL:url];

...and pass that into your NSURLConnection so it actually does something:

self.test = [[NSURLConnection alloc]initWithRequest:request  delegate:self];

...because then, as soon as the connection finishes doing its work—successfully or otherwise—its memory will be deallocated.

NSURLSession and Connection terrible memory leaks

1 Answers