From http://stackoverflow.com/questions/1952219/iphone-nsurl-get-last-redirected-url

new_gist_file

NSURL *originalUrl=[NSURL URLWithString:@"http://YourURL.com"];
NSData *data=nil;  
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:originalUrl cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];
NSURLResponse *response;
NSError *error;
data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSURL *LastURL=[response URL];
[request release];
[error release];