How to get server response code for each request in WebView - ios

Question

I have authorization logic managed via WebView:
user click on login button in app
I open WebView with loading login webpage (opened by url address)
user provide their login and password > click on login button on page
next page is opened in WebView - authorize access confirmation page
user has to click on authorize access button on webpage
after this redirect_uri URL will be tried to be opened in WebView
I catch this redirect_uri in request and close WebView
I inspect all requests (in order to catch redirect_uri) in WebView delegate method shouldStartLoadWithRequest:.
Question: how can I manage server response for each request for page opened in WebView?
The point is that we have some problems with auth server and time to time it shows error pages. So I want to catch such pages and close WebView for such cases.

Answer 1

found the solution via WKWebView.
I connected it the same way as UIWebView worked in my project.
And then I actually use 2 methods from WKNavigationDelegate protocol:
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
and
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
Example of code:
first method is to check whether current request is actually our redirect_uri that we should handle:
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
NSLog(#"request: %#", navigationAction.request);
// check whether this request should be stopped - if this is redirect_uri (like user is already authorized)
if (...) {
self.webView.navigationDelegate = nil;
// do what is needed to send authorization data back
self.completionBlock(...);
// close current view controller
[self dismissViewControllerAnimated:YES completion:nil];
// stop executing current request
decisionHandler(WKNavigationActionPolicyCancel);
} else {
// otherwise allow current request
decisionHandler(WKNavigationActionPolicyAllow);
}
}
second method is to analyse response from server, and here we can verify the status code in order to handle any errors
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
// filter the responses, in order to verify only the response from specific domain
if ([[NSString stringWithFormat:[[response URL] absoluteString]] containsString:#"some.domain.com/"]) {
NSInteger statusCode = [response statusCode];
// check what is the status code
if (statusCode == 200 ||
statusCode == 301 ||
statusCode == 302) {
// allow response as everything is ok
decisionHandler(WKNavigationResponsePolicyAllow);
} else {
// handle the error (e.g. any of 4xx or any others)
self.webView.navigationDelegate = nil;
// send needed info back
self.completionBlock(...);
// close current view controller
[self dismissViewControllerAnimated:YES completion:nil];
// stop current response
decisionHandler(WKNavigationResponsePolicyCancel);
}
} else {
// current response is not from our domain, so allow it
decisionHandler(WKNavigationResponsePolicyAllow);
}
}

Answer 2

Implement below delegate method might be work for you.
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSCachedURLResponse *urlResponse = [[NSURLCache sharedURLCache] cachedResponseForRequest:webView.request];
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*) urlResponse.response;
NSInteger statusCode = httpResponse.statusCode;
NSLog(#"%#",statusCode);
}

Answer 3

In swift, you can try and cast the URLResponse to HTTPURLResponse to get the statusCode field.
extension MyController: WKNavigationDelegate {
func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse,
decisionHandler: #escaping (WKNavigationResponsePolicy) -> Void) {
if let httpResponse = navigationResponse.response as? HTTPURLResponse {
let statusCode = httpResponse.statusCode
//....
}
decisionHandler(.allow)
}
}