- (void)downloadAtURLString:(NSString *)urlString
{
    NSMutableData *data = [[NSMutableData alloc] init];
    self.activeDownload = data;
    [data release];
    // encode the urlString with percent escapes
    NSString *urlStr = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *url = [[NSURL alloc] initWithString:urlStr];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    self.urlConnection = conn;
    [conn release], [request release], [url release];
 }

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30.0];

- (void)downloadAtURLString:(NSString *)urlString
{
    NSMutableData *data = [[NSMutableData alloc] init];
    self.activeDownload = data;
    [data release];
    // encode the urlString with percent escapes
    NSString *urlStr = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *url = [[NSURL alloc] initWithString:urlStr];
    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:30.0];
    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    self.urlConnection = conn;
    [conn release], [request release], [url release];
 }