Is it possible to know referrer for GURL call received via AppleScript event?

Question

I have a protocol handler associated with my Cocoa application.

[[NSAppleEventManager sharedAppleEventManager] 
    setEventHandler:self
    andSelector:@selector(getUrl:withReplyEvent:)
    forEventClass:kInternetEventClass andEventID:kAEGetURL];    

...

- (void)getUrl:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent
{
#ifdef DEBUG
    NSLog(@"%s: %@",__PRETTY_FUNCTION__,event);
#endif
    NSURL *url = [NSURL URLWithString:[[event paramDescriptorForKeyword:keyDirectObject] stringValue]];
...
}

Who is referrer? (if it called from local machine I think it can be undefined, but if I call this protocol from a Web site... I would like to know domain from which the request is received.

Is it possible at all?

Is there solution to solve this task by another way?

Answer 1

From: http://www.cocoabuilder.com/archive/cocoa/125741-finding-the-sender-of-an-appleevent-in-cocoa-app-on-10-2-8-or-greater.html

NSAppleEventDescriptor *addrDesc = [event
attributeDescriptorForKeyword:keyAddressAttr];
NSData *psnData = [[addrDesc
coerceToDescriptorType:typeProcessSerialNumber] data];

if (psnData)
{
 ProcessSerialNumber psn = *(ProcessSerialNumber *) [psnData bytes];
 ...
}