Use http scheme instead of zim in our internal links.

[mgautierfr]

kiwix-desktop use a specific scheme zim:// in the webview to reference content provided by our urlschemhandler. This allow a well defined separation between http content which link to actual online content (which should be catch/blocked/opened with web browser) and our internal content which need a url.

However, few features (as service worker #487 or Phet zim file #915) need a http:// scheme.

We should rethink how we build our internal urls and use http scheme all the time. (Use a specific host to reference internal content ?)

[kelson42]

@mgautierfr We have custom protocol handler on Android. We should keep it here, bit implement it in a way it works. I strongly oppose to launch a http daemon.

[mgautierfr]

I don't want to launch a http daemon. I want to change the scheme of the url from zim:// to http://. Simply because a lot of technologies in the web word expect http:// and using zim:// breaks things.

[kelson42]

AFAIK nothing expects here the http:// scheme (we have no URL of that type in ZIM files to access local content) and it would be abusing the HTTP protocol to provide ZIM access using it. For example, in #915, the URL failing is zim://fbd2f790-5d36-fccc-df2d-c22f94be3a69.zim/-/en.json. We need a zim:// protocol working properly.

[mgautierfr]

In #915, I understand that Fetch API cannot load zim://fbd2f790-5d36-fccc-df2d-c22f94be3a69.zim/-/en.json. URL scheme "zim" is not supported. means that the js content of the libzim itself refuse to load things using the zim scheme. It is not us refusing the request.

[kelson42]

@mgautierfr After reading this I was somehow under the impression, the problem has been fixed recently. Reading #915 seems to confirm this as well.

If this is confirmed, this ticket is not the way to follow. We should be able to fix #487 simply after kiwix/kiwix-build#594 is implemented, using a custom protocol.

[kelson42]

Considering that both#487 and 915 have been closed, this issue has lost its justification