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Implemented post task using NSURLSession and was sending a dectionary in the body of NSMutableURLRequest. The Strings in the dictionary stays in the memory even after the task is done.NSError *error; NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil]; NSURL *url = [NSURL URLWithString:@"http://127.0.0.1:3030/validate"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60.0]; [request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request addValue:@"application/json" forHTTPHeaderField:@"Accept"]; [request setHTTPMethod:@"POST"]; NSMutableDictionary *mapData = [[NSMutableDictionary alloc] initWithObjectsAndKeys: @"darkhorse", @"usrname", nil]; NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error]; [request setHTTPBody:postData]; NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { }]; [postDataTask resume];Was able to dump the strings using below commands:Step 1 : Connect lldb debugger to device/simulatorStep 2 : Import => "script import lldb.macosx.heap"Step 3 : Search for strings "cstr_refs CSTRING "darkhorse"" after the NSURLSessionDataTask is done