Modify URL request in shouldStartLoadWithRequest method and displaying in Webview - iphone

Question

I have one webview and 3 url.
So when application starts i am showing URL1 in webview.
Now when i select any portion of webview it will redirect to URL2.
But only i want to fetch some data from URL2 and dont want to show it to user.
Which i can able to do by using shouldStartLoadWithRequest: method with return NO.
but Now i need to show URL 3 with data received from URL2 in my Webview.
But it is not showing anything ,how can i do it ?
For this i am using following code
-(void)viewDidLoad
{
//Normal showing of URL1 in webview
}
- (BOOL)webView:(UIWebView*)webViewRef shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
{
if(selectedDataExist){
//get data from URL2
//Make New URL3 string
[webView loadRequest: [NSURLRequest requestWithURL:[NSURL URLWithString:myNewUrlString]]];
return NO;
}
else
{
//by default URL1 comes
return YES;
}

Answer 1

i did this:
i was trying to send a info via GET method so i substring the last 10 characters (in my case) of any url requested, if it doesn't have the GET method, it make a new request appending the GET method to the url and return NO, next time this function get called it will have the GET method so it will continue.
-(BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSString *urls = [request.URL absoluteString];
NSString *code = [urls substringFromIndex: [urls length] - 10];
if (![code isEqualToString:#"?iphone=si"]) {
NSURL *nueva = [NSURL URLWithString:[NSString stringWithFormat:#"%#?iphone=si",urls]];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:nueva];
[self.mywebview loadRequest:requestObj];
return NO;
}
return YES;
}

Answer 2

This is how I do it
NSURL *LocalUrl = [[NSURL alloc] initWithString:[newUrl stringByAddingPercentEscapesUsingEncoding: NSASCIIStringEncoding]];
NSURLRequest *objNSURLRequest;
objNSURLRequest = [NSURLRequest requestWithURL:LocalUrl];
[yourwebview loadRequest:ObjNSURLRequest];
[LocalUrl release];
return NO;