HTTP 504 Gateway Timeout

In short: A gateway waited too long for the response of the server behind it.

In more detail: The backend answers, but too slowly.

In Depth

Possible causes

• Slow database query or external API.
• Proxy time limit too small.

Solutions

1. Optimise the slow spot (index, caching).
2. Raise timeouts appropriately.
3. Move long tasks into background jobs.

See also: HTTP 502 Bad Gateway, Latency, Database