获取网页状态码

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

{

    NSHTTPURLResponse *response = nil;

    [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];

    NSLog(@"网页状态码 = %zd",response.statusCode);

    if (response.statusCode == 404) {

    }

    return YES;

}