CORS - XMLHttpRequest cannot load file:/// URIs

[rayshan]

大家好，

Seems like WKWebView in iOS 8 doesn't support loading content via XMLHttpRequest due to CORS enforcement. In iOS 9 maybe [WKWebView loadFileURL:allowingReadAccessToURL:] can work (reference). I just tried crosswalk-ios 1.2 in iOS 9 and hit this error. Any ideas of how to load local files via files:/// protocol?

[jondong]

@rayshan Thanks for trying Crosswalk. The implementation of [XWalkView loadFileURL:allowingReadAccessToURL:] in iOS 9 is to hook up WKWebView's same api, so it should behave the same as WKWebView. Would you please elaborate or paste your error log here for us to identify the issue? That would be really helpful.

Meanwhile, according to http://www.w3.org/TR/url/#concept-url-scheme, the scheme files:/// is not supported, is it a typo?

[rayshan]

My pleasure! No files:/// isn't a typo. This is the error message:

XMLHttpRequest cannot load file:///Users/rayshan/Library/Developer/CoreSimulator/Devices/xxx/data/Containers/Bundle/Application/xxx/crosswalk.app/www/package.json. Cross origin requests are only supported for HTTP.

I think this is a known issue with WKWebView, and the only workaround I can find is to spin up a local server to serve local resources via http. I believe it's the same issue as these:
Telerik-Verified-Plugins/WKWebView#149
https://issues.apache.org/jira/browse/CB-10143