Get UIWebView response header

Question

I have looked into ways to get response header from UIWebview response. This SO question discusses it. But I am unsure if this is allowed by apple. I will have a webview showing a loaded login page and need to get the response headers after a successful login. Also this

does something to get status code. But it create a duplicate NSUrlConnection request. Is there any way by which I can achieve this? I would appreciate any information on this.

As the creator of that answer, I personally can't say if it would pass inspection, although I have used similar techniques in apps that I have put on the store which have passed just fine. YMMV, the only way to know for sure is to submit the app for review. — Richard J. Ross III, Mar 11 '14 at 13:47

score 14 · Answer 1 · edited Dec 30 '15 at 20:08

In addition to the answer provided by DBD, you will need to ensure that

The containing UIViewController is marked as a UIWebViewDelegate in the .h file:

@interface VIMAuthenticationViewController : UIViewController <UIWebViewDelegate>

The UIWebView's delegate is set to the containing UIViewController. This can be done directly in the Interface Building or by linking the web view and adding the following in view did load in .m fie:
```
[self.WebView setDelegate:self];
```

Add the code as provided by DBD:

(void)webViewDidFinishLoad:(UIWebView *)webView {
   NSCachedURLResponse *resp = [[NSURLCache sharedURLCache] cachedResponseForRequest:webView.request];
   NSLog(@"%@",[(NSHTTPURLResponse*)resp.response allHeaderFields]);
}

Holy crap. Additional context provided in a mobile app answer. That has to be a sign of the apocalypse and worthy of more +1s than I can sadly give. — Erik Reppen, Jan 22 '16 at 23:46

score 11 · Answer 2 · answered Aug 05 '14 at 15:22

11

This should do it for you.

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSCachedURLResponse *resp = [[NSURLCache sharedURLCache] cachedResponseForRequest:webView.request];
    NSLog(@"%@",[(NSHTTPURLResponse*)resp.response allHeaderFields]);
}

answered Aug 05 '14 at 15:22

DBD

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6

sometimes it return nil? – neobie Feb 24 '16 at 13:27
6

what if the cached response is null ? how do you handle that situation ? – lifemoveson Mar 24 '16 at 04:27
1

It can be `nil`. Make sure to set `NSURLRequestUseProtocolCachePolicy` when creating your request. – Rivera Aug 08 '18 at 17:53

score 0 · Answer 3 · answered Nov 22 '18 at 10:01

0

Swift 4

func webViewDidFinishLoad(_ webView: UIWebView) {

    let headers = webView.request?.allHTTPHeaderFields
    for (key,value) in headers! {
        print("key \(key) value \(value)")
    }
}

answered Nov 22 '18 at 10:01

Charlie S

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score 0 · Answer 4 · edited Dec 29 '18 at 08:56

0

NSCachedURLResponse *resp = [[NSURLCache sharedURLCache] cachedResponseForRequest:webView.request];   
NSLog(@"%@",[(NSHTTPURLResponse*)resp.response allHeaderFields]);

this function sometimes it returns nil, I looked it up, If the file size exceeds 50kb, NSURLConnection does not call storeCachedResponse: forRequest;

edited Dec 29 '18 at 08:56

dkb

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answered Dec 29 '18 at 05:22

breeze

1

score -1 · Answer 5 · answered Nov 18 '18 at 16:45

Swift 4

override func viewDidLoad() {
    super.viewDidLoad()
    webView.delegate = self
}

func webViewDidFinishLoad(_ webView: UIWebView) {
    if let request = webView.request {
        let response = URLCache.shared.cachedResponse(for: request)
        // ...
    }
}

Get UIWebView response header

5 Answers5

Linked