GitHub user dosubot[bot] added a comment to the discussion: Login redirection 
does not use subpath prefix

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@thiagogquinto There are a couple of things likely causing the 404 when you 
click login.

**1. `x_prefix` may be double-prefixing your routes**

Since you're deploying under a subpath (`/analytics_pr`), you likely have 
`SUPERSET_APP_ROOT` (or Flask's `APPLICATION_ROOT`) set. If that's the case, 
having `x_prefix: 1` in `PROXY_FIX_CONFIG` while *also* setting the prefix via 
`SUPERSET_APP_ROOT` can cause routes to be double-prefixed. Try setting 
`x_prefix: 0`:

```python
PROXY_FIX_CONFIG = {
    "x_for": 1,
    "x_proto": 1,
    "x_host": 1,
    "x_port": 1,
    "x_prefix": 0  # avoid double-prefixing when SUPERSET_APP_ROOT is set
}
```

If you're **not** using `SUPERSET_APP_ROOT`, you should set it:

```python
SUPERSET_APP_ROOT = "/analytics_pr"
```

**2. The OAuth redirect URI is likely wrong**

Flask-AppBuilder registers the OAuth callback at 
`/oauth-authorized/<provider>`, so your redirect URI of 
`https://DOMAIN/analytics_pr/oauth-authorized/google` looks correct in form. 
However, the 404 suggests the route isn't being reached — which points back to 
the prefix/proxy issue above. Once the prefix configuration is fixed, this 
route should resolve properly.

Make sure the redirect URI registered in your **Google Cloud Console** matches 
exactly what Superset expects (including the `/analytics_pr` prefix).

**3. Consider using `server_metadata_url` for Google (optional but 
recommended)**

Your current config uses manually specified endpoint URLs. Using Google's OIDC 
discovery endpoint is simpler and less error-prone:

```python
OAUTH_PROVIDERS = [
    {
        "name": "google",
        "icon": "fa-google",
        "token_key": "access_token",
        "remote_app": {
            "client_id": "YOUR_GOOGLE_CLIENT_ID",
            "client_secret": "YOUR_GOOGLE_CLIENT_SECRET",
            "client_kwargs": {
                "scope": "openid email profile"
            },
            "server_metadata_url": 
"https://accounts.google.com/.well-known/openid-configuration";,
        },
    }
]
```

**To summarize**, the most likely culprit is the proxy prefix configuration 
causing a mismatch between where Traefik routes the callback and where Flask 
registers the OAuth route. Fix the `PROXY_FIX_CONFIG` and ensure 
`SUPERSET_APP_ROOT` is set correctly, and the 404 should resolve. If it 
persists, could you share the full URL you're being redirected to when the 404 
occurs? That would help pinpoint whether it's a double-prefix or a 
missing-prefix issue.


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GitHub link: 
https://github.com/apache/superset/discussions/40082#discussioncomment-18057199

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