breautek commented on issue #1378:
URL: https://github.com/apache/cordova-ios/issues/1378#issuecomment-1754886876
> Is there any possibility for CORDOVA-IOS to be rendered as android. So, we
can ignore custom scheme?
By default iOS uses the `file://` protocol. A **better** protocol to use is
a custom scheme which can be controlled via `scheme` and `hostname`
preferences, however if you have an existing app already using the `file://`
protocol see the notes at the end.
```xml
<platform name="ios">
<preference name="scheme" value="app" />
<preference name="hostname" value="localhost" />
</platform>
```
But the caveat is the scheme cannot be set to any well known protocol that
`WKWebView` already binds, so that includes `http` or `https`, making it
impossible to have it configured identically as Android. Likewise, Android only
allows `http` or `https` in its equivilant API, making it impossible to make
Android behave like iOS in this regard.
Nonetheless, using non-file schemes on both platforms will resolve CORS
issue among device-local resources, with the exception that if you utilises
`cdvfile` or other `file` plugin resources in the DOM, you may need to refactor
to use a specific API to get a DOM-usable URL.
Communicating with a server will still result in CORS and that must be
resolved in the server-side configuration.
**IF you have an existing app** that is already using the `file://`
protocol, switching to a scheme-based protocol changes the "origin" of your
app. This means all your web storage containers (indexedDB, local storage,
cookies, etc) all gets a new container because they are all associated with an
origin. If that data is important and cannot be easily reconstructed, the old
data is still present, but inaccessible without having a plugin to migrate the
data from the old container into the new container.
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