// create the URL NSURL *postURL = [NSURL URLWithString:@"http://twitpic.com/api/upload"]; // create the connection NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:postURL // change type to POST (default is GET) [postRequest setHTTPMethod:@"POST"]; // just some random text that will never occur in the body NSString *stringBoundary = @"0xKhTmLbOuNdArY---This_Is_ThE_BoUnDaRy..