gistfile1.m

@implementation ServerRequester : CPObject
{
	CPString _returnData @accessors(property=returnData);
        id _delegate @accessors(property=delegate);
}

- (void)request:action data:(Object)jsonData
{
	var actionURL = null;

	switch(action)
	{
		case "login":
			actionURL = "multivac/login";
			break;
	}
	
	[self executeRequest:actionURL data:jsonData];
}

- (void)executeRequest:url data:(Object)jsonData
{
	var request = [CPURLRequest requestWithURL:url];
	[request setHTTPMethod:@"POST"];
	[request setHTTPBody:jsonData];
	
	var connection = [CPURLConnection connectionWithRequest:request delegate:self];
}

- (void)connection:(CPURLConnection)aConnection didReceiveData:(CPString)data
{
	[self setReturnData:data];
        if([self delegate])
          [[self delegate] connection:aConnection didReceiveData:data];
}

- (void)connection:(CPURLConnection)aConnection didFailWithError:(CPString)error
{
	alert(error);
}

@end

gistfile2.m

- (void)login:(id)sender
{
	var jsonData = CPJSObjectCreateJSON({"userName": [userName stringValue], "password": [password stringValue]});
	
	requester = [[ServerRequester alloc] init];
        [requester setDelegate:self];
	[requester request:"login" data:jsonData];

}

- (void)connection:(CPURLConnection) didReceiveData:(CPString)data
{
      var loginData = [requester returnData];
	
	alert(loginData);
}