Routing of flutter web app hosted on Google Cloud Storage is not working

I am hosting a Flutter web app on Google Cloud Storage which works fine and is accessible via my sub domain app.mydomain.com. In general i'm pretty happy with Google Cloud Storage since it is easy to deploy and the costs of hosting are cheap.

Unfortunately, routing is a problem. When i navigate via the app to the login page the address bar changes to app.mydomain.com/login and the login page is shown. But when i reload the page via the browser's reload button, I see the following XML

<Error>
    <Code>NoSuchKey</Code>
    <Message>The specified key does not exist.</Message>
</Error>

I assume this is because Google Cloud Storage wants to fetch the index.html file in the login folder. However, the bucket does not contain such a login folder.

Question:

How can I get this running?
Is it possible to deactivate the feature of fetching subfolders within a bucket to redirect the information of the address bar to my flutter app?
What would be a cheap alternative if there is no alternative?

Solution

Well, I figured out the problem.

If you pay close attention the the URL which i've posted in the question you might notice that the URL lacks the # character which is normally present. This is because i've had set setPathUrlStrategy() from the url_strategy package.

So instead of using app.mydomain.com/login my URL now looks like this app.mydomain.com/#/login which causes Google Cloud storage to correctly forward the URL to my application instead of trying to fetch a file or folder within the bucket.