RPC call from webapp do not receive response

[Chralu]

Describe the problem you discovered

Making a deeplink RPC call from a webapp (in browser) does not receive the response.
The RPC sever will open a webview instead of redirecting to the web browser which made the call.

Describe the solution you'd like

This has two causes :

• the launchUrl callback should delegate decision to the OS (mode: LaunchMode.externalApplication).
• the callbackURL should be the same URL as the one initiating the request, plus RPC response.

Example :

1. https://my-app.com/a-subroute makes an RPC call to myapp://
2. myapp:// processes the request an sends result to https://my-app.com/a-subroute#deeplinkrpcresponse=<encoded response>

Epic

No response