NSURLRequest sets additional behaviour to a to be loaded NSUrL, like timeout, use of cache and headers.

as example request a URL with a specific HTTP header tag: (MiniBrowser sample)

NSMutableURLRequest *urlRequest; urlRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@”myURL”]]; [urlRequest setValue:@”myURL” forHTTPHeaderField:@”Referer”]; [[webView mainFrame] loadRequest:urlRequest];

http://www.w3.org/Protocols/HTTP/Request.html http://www.w3.org/Protocols/HTTP/HTRQ_Headers.html