macOS NSURLConnection won't call delegate methods

//
//  redeemHandler.m
//  Checker
//
//  Created by Samuli Lehtonen on 5.7.2010.
//  Copyright 2010 Test. All rights reserved.
//

#import "redeemHandler.h"


@implementation redeemHandler
@synthesize intervalValue;


-(void)testFunction
{
NSLog(@"Running threadFunction!");
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while (checking) {
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com/"]
  cachePolicy:NSURLRequestUseProtocolCachePolicy
  timeoutInterval:60.0];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];


if (theConnection) {
receivedData = [[NSMutableData data] retain];
NSLog(@"Succeeded! Data lenght: %d", [receivedData length]);
}
else {
NSLog(@"Connection failed!");
}
sleep(1);
}


[pool release];


}


-(IBAction)startChecking:(id)sender
{
if ([sender selectedSegment] == 0) {
[sender setEnabled:YES forSegment:1];
[statusText setStringValue:@"Checking in progress..."];
[sender setEnabled:NO forSegment:0];
[statusBar startAnimation:sender];
checking = YES;
urlThread = [[NSThread alloc] initWithTarget:self selector:@selector(testFunction) object:nil];
[urlThread start];
NSLog(@"Started!");
}
else {
[sender setEnabled:YES forSegment:0];
[sender setEnabled:NO  forSegment:1];
[statusText setStringValue:@"Checking not in progress..."];
[statusBar stopAnimation:sender];
checking = NO;
[urlThread release];
urlThread = nil;
}


}



-(IBAction)openOptions:(id)sender
{
[NSApp beginSheet:optionsSheet modalForWindow:mainWindow modalDelegate:self didEndSelector:NULL contextInfo:nil];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
intervalValue = [defaults integerForKey:@"Interval"];


// NSLog(@" is: %@", [defaults valueForKey:@"Interval"]);



}

-(IBAction)closeOptions:(id)sender
{
[optionsSheet orderOut:nil];
[NSApp endSheet:optionsSheet];

}

-(IBAction)closeAndSaveOptions:(id)sender
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setInteger:intervalValue forKey:@"Interval"];
[defaults synchronize];
/*NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSLog(@" is: %@", [defaults valueForKey:@"Interval"]);*/
[optionsSheet orderOut:nil];
[NSApp endSheet:optionsSheet];


}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
NSLog(@"Received response!");
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSLog(@"Received data!");
[receivedData appendData:data];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"Succeeded! Received %d bytes of data", [receivedData length]);
[connection release];
[receivedData release];
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[connection release];
[receivedData release];


NSLog(@"Connection failed!");
}

@end