How to get page contents or json content of a URL from a domain that's already authenticated?

[akhileshshastri-bpi]

I'm building a Tauri wrapper around an external webpage. What I'm trying to do is launch the webpage, which will take the user to the login screen. Then the user will login as usual. The user will then be redirected to the homepage. When the user comes back another day and opens the app again, they will still be authenticated. I assume this is because the cookie gets stored in local storage somewhere.

My question is, can I use that cookie to perform a request to an API that's under the same domain as the webpage I mentioned earlier? I want to fetch the json contents of the page. If not, perhaps I can encrypt and store the cookie in a secure location. In that case, how can I retrieve the cookie from local storage?

What I've tried:

• Using fetch from the http plugin but it didn't use the cookie in local storage and instead fetched the content of the login screen.
• Launching the API URL in a new window and that worked, but I couldn't figure out a way to retrieve the page contents of the web view window.
• Using the eval method on the WebView window. But I couldn't figure out how to get the result of the eval as json.

Any ideas?

Edit: I'm using Tauri v2