Migrate blichess to Capacitor 6. Handling https issue

[vovagorodok]

In order to release blichess on Google Play, upgrade to Capacitor 6 (SDK 34) is needed.

Ported version compiles and works fine:
vovagorodok/blichess@bluetooth...vovagorodok:blichess:migrate-to-capacitor-6
Except one error. After migration, application can't connect to lichess.org, because of log:
File: https://localhost/ - Line 0 - Msg: Access to fetch at 'https://lichess.org/' from origin 'https://localhost' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

Adding to capacitor.config.ts (according to https://capacitorjs.com/docs/guides/autofill-credentials#set-capacitor-server-hostname):

  server: {
    hostname: 'lichess.org',
    androidScheme: 'https'
  }

helps a bit (solve CORS issue?), but next issue is visible:
File: https://lichess.org/ - Line 1 - Msg: Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
Even for Capacitor 5 after adding it. Looks that adding server fix CORS for Capacitor 6, but broke somenhing for Capacitor 5 and 6

Is here any breakthrough change between Capacitor 5 and 6 for https handling?

[jcesarmobile]

If you set the hostname to the same url your remote server is located, the requests won't reach your server as any request to https://lichess.org will be treated as a local request.

There has always been CORS "problems" when using with Capacitor, since version 1, it's not really a Capacitor issue but a WebView issue, nothing has changed from Capacitor 5 to Capacitor 6 to cause CORS errors, you should have had CORS errors in Capacitor 5 already.

[vovagorodok]

Thanks @jcesarmobile for response. Hmm, strange. In Capacitor 5 it works without CORS errors (I have double checked it). I have CORS errors only after simple migration to Capacitor 6: vovagorodok/blichess@bluetooth...vovagorodok:blichess:migrate-to-capacitor-6

[jcesarmobile]

looks like you configured your server to allow CORS requests from http://localhost, you have to update the server to allow https://localhost instead, or configure your app to keep using http instead of https.

[vovagorodok]

Fixed by:

  server: {
    hostname: 'localhost',
    androidScheme: 'http'
  }

@jcesarmobile thank You so much for help!