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

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<!-- Answer -->
This error is a **TLS/network issue**, not a Superset configuration problem. 
Your backend application is trying to connect to `superset:8088` using 
**HTTPS** (`fetch` over TLS), but Superset's internal port 8088 serves **plain 
HTTP** — TLS is terminated by Traefik, not by Superset itself. The TLS 
handshake fails because there's no TLS listener on port 8088.

**The fix:** When your backend calls the guest token API internally 
(container-to-container), use **HTTP** instead of HTTPS, and connect directly 
to Superset's internal address:

```javascript
// ❌ Wrong — trying TLS against a plain HTTP port
fetch("https://superset:8088/api/v1/security/guest_token/";, ...)

// ✅ Correct — use HTTP for internal container-to-container calls
fetch("http://superset:8088/api/v1/security/guest_token/";, ...)
```

Since your backend is in the same Docker network as Superset, it can reach 
Superset directly without going through Traefik. The `/analytics` prefix is 
only needed when going through Traefik — internally, Superset doesn't know 
about that prefix at the network level, so you should **not** include 
`/analytics` in internal calls either:

```javascript
// Internal call (container-to-container, bypassing Traefik)
fetch("http://superset:8088/api/v1/security/guest_token/";, {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Authorization": "Bearer YOUR_API_TOKEN"
  },
  body: JSON.stringify({
    user: { username: "guest", first_name: "Guest", last_name: "User" },
    resources: [{ type: "dashboard", id: "your-dashboard-uuid" }],
    rls: []
  })
});
```

**Alternatively**, if you prefer to go through Traefik (e.g., for consistency), 
use the HTTPS URL with the `/analytics` prefix:

```javascript
fetch("https://localhost/analytics/api/v1/security/guest_token/";, ...)
```

But note that `localhost` from inside a Docker container refers to the 
container itself, not the host machine. You'd need to use the Traefik service 
name or the host's network address instead. The simplest approach is the direct 
HTTP call to `superset:8088`.


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GitHub link: 
https://github.com/apache/superset/discussions/40082#discussioncomment-17662867

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