> ## Documentation Index
> Fetch the complete documentation index at: https://docs.auriko.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# upstream_timeout

> HTTP 504 — Upstream exceeded the request deadline.

## HTTP status

`504 api_error`

## Typical cause

The upstream provider did not respond within the deadline for this request.

## Resolution

Set `gateway.routing.timeout_ms` to allow more time per attempt. For fallback chains, also set `gateway.routing.deadline_ms` to extend the overall request budget. You can also retry with backoff, reduce prompt or output size, or try a faster model.