Firebase App Hosting and auth: /__/auth/handler problem

[tepid ledge]

So not clear if this is my responsibility or that of Firebase...

I am hosting my app on Firebase App Hosting (https://jambudipa.io) and when I click on log in with Google, I am sent to https://jambudipa.io/__/auth/handler/.......

This route does not exist, and so I get a 404.

When using standard Firebase hosting, this is configured mostly automatically from what I remember.

Anyone have success with this? I am unclear what to do.

[brave sedge]

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[tepid ledge]

So I have it partially working, with this config:```onst nextConfig: NextConfig = {
output: 'standalone',
async rewrites() {
return [
{
source: '//auth/handler',
destination: '/auth/callback'
},
{
source: '//auth/iframe',
destination: '/auth/iframe-custom'
}
];
}
};

The auth callback page is working fine, but I have just discovered this iframe and I have no idea what it would ordinary do. I have just created a dummy component that does basically nothing, so we shall see...