Intercepting spawned URL requests from UIWebView

I'm trying to cache specified web pages to disk by NSURLProtocol,now I can only get the first URL request, but the UIWebView spawns further URL requests for loading graphics. So how can I Intercept all the requests spawned by UIWebView from the first URL? Thank you very much!

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Implement delegate method

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;

every time your webview loads url it will first call this method.

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