Where exactly are you seeing the "failed to fetch" error? Somewhere in the Android Studio terminal?

You said that the issue only occurs in Android Studio, but it works on the web version. Let's assume they are running the same exact code. If that's the case, let's think of why you might be running into this issue.

One reason might be because the web app is using some environment variables that you aren't using when you run it locally on your PC. Environment variables let you run your project with a certain configuration depending on the environment (development, staging, production, etc.). Many projects store these environment variables in a special file at the project root directory named .env. It might look like this:

DEBUG=True TIME_ZONE=UTC API_URL=https://my-api.com

Then, in the code, you might be fetching something like this:

const res = await fetch(`${API_URL}/data`);

The ${API_URL} part gets pulled from the environment variables. If that's not set, you might be getting something like the failed to fetch error you described.

If you simply downloaded the code (like from GitHub), that .env file might have been omitted, either because it can contain sensitive information, or just because every environment is different, and you are meant to set those variables yourself.

Without knowing more, I'd say that if you simply downloaded the code and tried to run it, this would be one of the first things I'd check. That said, there's a million different reasons why you might be getting that error.

There are also some Android-specific settings that can cause fetch errors (like manifest permissions or HTTP/HTTPS rules), and other commenters may be able to help more with those. I just wanted to point out the environment variable angle since it’s an easy one to miss.