Shazron Abdullah commented on CB-10143:

That plugin looks good and is an acceptable way to workaround this. Would be 
great if they contributed it back to Cordova.

> Local file:// url XmlHttpRequests are not allowed in WKWebViewEngine
> --------------------------------------------------------------------
>                 Key: CB-10143
>                 URL: https://issues.apache.org/jira/browse/CB-10143
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: cordova-plugin-wkwebview-engine
>            Reporter: Shazron Abdullah
>              Labels: wkwebview-known-issues
> mobile-spec failure in XMLHttpRequest.spec.4 is a known WKWebView issue, 
> where CORS is now respected and cannot load files from file:// urls, only 
> http*:// urls are allowed.
> With CSP off to rule things out:
> XHR to yourself of course works, but doesn't really make sense for
> real-world use. XHR to a sibling file, parent file, or any child file
> results in the error ""Cross origin requests are only supported for
> HTTP”.
> To illustrate:
> {code}
>   |
> parent.xml
>   |
> www
>   |---- index.html (file currently loaded)
>   |---- sibling.xml
>   |---- child-folder
>   |       |---- child.xml
> {code}
> index.html is the currently loaded file in the WebView. From it, you
> can't load parent.xml, sibling.xml nor child.xml using XHR according
> to my tests.
> The workaround is implementing CB-10109

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