NSURLConnection delegate methods are not called

I am trying to create a simple NSURLConnection to communicate with a server using a GET request. Connection works well, but delegates methods of NSURLConnection are never called..

Here is what am doing:

NSString *post = [NSString stringWithFormat:@"key1=%@&key2=%@&key3=%f&key4=%@", val1, val4, val3, val4];
    
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease] ;

[request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://www.domain.com/demo/name/file.php?%@", post]]];

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];

Have implemented the following delegate methods, but none of them is called..

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
	NSLog(@"did fail");
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
	NSLog(@"did receive data");
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
	NSLog(@"did receive response ");
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
	NSLog(@"did finish loading");
	[connection release];
}

Am I missing something?

Try running the operation on main thread:

NSURLConnection * connection = [[NSURLConnection alloc] 
                                initWithRequest:request
                                       delegate:self startImmediately:NO];

[connection scheduleInRunLoop:[NSRunLoop mainRunLoop] 
                      forMode:NSDefaultRunLoopMode];
[connection start];

Are you calling this on a background thread? If you are performing this on a background thread, the thread is probably exiting before the delegates can be called.

Try to check length for the received response it should not getting 0 byte of data.

Apart from checking if the request is called from the main thread, you can check if you give back execution time to the system (if you exit "main"). I had some test code that would stay in a loop until the delegate was called : it would never be called, because the system needs to do stuff in order for the delegate to be called, in the main thread.