What causes "str(e)" in Significant-Gravitas/AutoGPT?

Check backend logs — logger.exception records the root cause before the 502 is raised.

Significant-Gravitas/AutoGPT · error · HTTPException

str(e)

Error message

str(e)

What it means

A catch-all 502 returned by the Otto proxy route when OttoService.ask raises any exception. The detail embeds str(e) of the underlying failure, so the real cause is usually one of the service-level errors (not configured, connect failure, timeout, upstream non-200) surfaced here as a Bad Gateway.

Source

Thrown at autogpt_platform/backend/backend/api/features/otto/routes.py:32

@router.post(
    "/ask",
    response_model=ApiResponse,
    dependencies=[Security(requires_user)],
    summary="Proxy Otto Chat Request",
)
async def proxy_otto_request(
    request: ChatRequest, user_id: str = Security(get_user_id)
) -> ApiResponse:
    """
    Proxy requests to Otto API while adding necessary security headers and logging.
    Requires an authenticated user.
    """
    logger.debug("Forwarding request to Otto for user %s", user_id)
    try:
        return await OttoService.ask(request, user_id)
    except Exception as e:
        logger.exception("Otto request failed for user %s: %s", user_id, e)
        raise HTTPException(
            status_code=502,
            detail={"message": str(e), "hint": "Check Otto service status."},
        )

View on GitHub (pinned to 9c8bb5550f)

Solutions

Check backend logs — logger.exception records the root cause before the 502 is raised.
Verify OTTO_API_URL is set and reachable from the backend container (curl it directly).
If the message says 'Otto service is not configured', set the Otto API URL in settings and restart.
If it's a timeout/connection issue, restore Otto service health or fix DNS/network policy between services.

Example fix

// before
detail={"message": str(e), "hint": "Check Otto service status."}
// after — don't leak raw internal exception text
detail={"message": "Otto request failed", "hint": "Check Otto service status."}

Defensive patterns

Strategy: retry

Validate before calling

// Probe Otto availability before sending real chat traffic
const health = await fetch('/api/otto/health').catch(() => null);
if (!health?.ok) throw new Error('Otto proxy unavailable');

Try / catch

try {
  return await ottoProxy.ask(req);
} catch (e) {
  const msg = e?.detail?.message ?? String(e);
  if (msg.includes('not configured')) throw new ConfigError('OTTO_API_URL missing');
  if (e.status === 504 || e.status === 503) await backoffRetry(2);
  else throw e;
}

Prevention

Treat the embedded str(e) as diagnostic only; branch on the known service-level messages (not configured / connect / timed out).
Don't retry 502s that wrap 4xx upstream failures — only retry on 503/504.
Alert on this 502 rate; it always indicates a backend/upstream problem, never client input.

When it happens

Trigger: POST to the Otto chat endpoint while the Otto backend is down, unreachable, returns a non-200 status, times out after 60s, or while OTTO_API_URL is unset (in which case the 503 detail text 'Otto service is not configured' is wrapped into this 502's message).

Common situations: OTTO_API_URL missing in the deployment environment; Otto upstream service not deployed or crashed; network egress blocked between backend and Otto; upstream 4xx/5xx propagated through the proxy.

Related errors

AI-assisted analysis of Significant-Gravitas/AutoGPT@9c8bb5550f (2026-08-14). Data as JSON: /api/errors/d940efcee707e977. Report an issue: GitHub.