Check if a file exists on the web

gistfile1.txt

+ (BOOL)webFileExists:(NSURL *)url
{
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];
    [request setHTTPMethod:@"HEAD"];
    NSHTTPURLResponse* response = nil;
    NSError* error = nil;
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    NSLog(@"Response length: %i", [data length]);
    NSInteger code = [response statusCode];
    [request release];
    return ( code != 404 );
}