WKWebView does not response correct MimeType in `decidePolicyForNavigationResponse`

Question

Created May ’20

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I want to detect the response MimeType so that accordingly handle the type of file that's being downloaded. So, for example, if the file type is `application/vnd.ms-excel` then I want to take certain action but, with WKWebView it is always returning `text/html` in `-(void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler`

I noticed that if I debug the WKWebView using Safari then the response MimeType is correctly displaying as `application/vnd.ms-excel` but, maybe because of QuickLook feature available in WkWebView the content is getting converted into HTML and responding `text/html`.

Is there any way to detect the mimeType apart from the above option that returns the actual file's mimeType?

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Answer 1

Systems Engineer OP

Apple

May ’20

The headers on the response are available in decidePolicyForNavigationResponse by casting the navigationResponse.response as (NSHTTPURLResponse *). And then taking a look at allHeaderFields. You should be able to see the Content-Type header in this way.

NSDictionary *HTTPResponseHeaders = ((NSHTTPURLResponse *)navigationResponse.response).allHeaderFields;

Matt Eaton

DTS Engineering, CoreOS

meaton3 at apple.com

0