I want to inform user when HTTP error 404 etc is received. How can I detect that? I've already tried to implement
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
but it is not called when I receive 404 error.
My implementation inspired by Radu Simionescu's response :
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSCachedURLResponse *urlResponse = [[NSURLCache sharedURLCache] cachedResponseForRequest:webView.request];
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*) urlResponse.response;
NSInteger statusCode = httpResponse.statusCode;
if (statusCode > 399) {
NSError *error = [NSError errorWithDomain:@"HTTP Error" code:httpResponse.statusCode userInfo:@{@"response":httpResponse}];
// Forward the error to webView:didFailLoadWithError: or other
}
else {
// No HTTP error
}
}
It manages HTTP client errors (4xx) and HTTP server errors (5xx).
Note that cachedResponseForRequest
returns nil
if the response is not cached, in that case statusCode
is assigned to 0 and the response is considered errorless.
You could capture the URLRequest here:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
and hand the request over to the delegate and return no. Then in the received response call from NSURLConnection
cancel the connection and if everything is fine (check response) load the urlrequest once more in the webview. Make sure to return YES in the above call when loading the urlrequest again.
Not very elegant, but it might work.
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