Get HTTP Response header on UIWebView

Question

How can I get HTTP headers response from WebView? I've found semi-solutions at Stackoverflow, but it's written on Objective-C and can't convert it to Swift (I've tried with my poor Obj-C knowledge).

Objective-C code:

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

1. How that code will look at Swift?
2. Maybe now we have better ways to do so? Caching is not always enabled.

Answer 1

Swift

Swift is more stringent ; you want to protect yourself against nil pointers and optionals:

• check that the webView actually has a request
• check that the request actually has a NSCachedURLResponse
• type-check the response against NSHTTPURLResponse

func webViewDidFinishLoad(webView: UIWebView) {
    if let request = webView.request {
        if let resp = NSURLCache.sharedURLCache().cachedResponseForRequest(request) {
            if let response = resp.response as? NSHTTPURLResponse {
                print(response.allHeaderFields)
            }
        }
    }
}

Answer 2

Just using this in SWIFT 3.1 :

if let request = webView.request {
            if let resp = URLCache.shared.cachedResponse(for: request) {
                if let response = resp.response as? HTTPURLResponse {
                    print(response.allHeaderFields)
                }
            }
        }