NSURLRequest

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