NSURLConnection Delegate

gistfile1.m

// inside MyHTTPRequest.m
- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)response {
  /* This delegate method is called before the connection sends a NSURLRequest.
     (NSURLResponse *)response will be nil when this method is not called by the delegate recieving a redirect
     (NSURLRequest *)request will contain the NSURLRequest object that (NSURLConnection *)connection is about
     to send to the server.

     For example, during an initial request to a server, this delegate method is called 
     and (NSURLResponse *)response will be nil, since the delegate has not received a HTTP 
     redirect ( the delegate has not received any response from the server yet because no request
     has been sent yet )
   */
  if (response != nil) { // response contains a HTTP redirect ( ie. status code 302)
    // request will now contain the redirected URL. Our original request data has been lost!
    // if the request is the same as the URL for the initial request, recreate
    // the original request, including the HTTP method, HTTPBody, and HTTPHeaderFields
    if ([[requestURL absoluteString] isEqualToString:[[request URL] absoluteString]]) {
      NSMutableURLRequest *newRequest = [[NSMutableURLRequest alloc] initWithURL:requestURL];
      [newRequest setHTTPMethod:requestMethod];
      if (requestBodyData != nil) {
	[newRequest setHTTPBody:requestBodyData];     
      }
      [newRequest setAllHTTPHeaderFields:[request allHTTPHeaderFields]];
      return [newRequest autorelease];
    } else {
    // request is not the same as our original request, so return the redirected request URL
      return request; 
    }
  } else {
    // response == nil so send the original request
    return request; 
  }
}