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https://issues.apache.org/jira/browse/CB-10143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16119027#comment-16119027
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Shazron Abdullah commented on CB-10143:
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That plugin looks good and is an acceptable way to workaround this. Would be
great if they contributed it back to Cordova.
https://github.com/oracle/cordova-plugin-wkwebview-file-xhr/blob/master/src/www/ios/xhr-polyfill.js
> 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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