SteadyNode

Vercel HTTP 504

What does a Vercel 504 gateway timeout mean?

Decode Vercel 504 gateway timeouts, identify slow functions or unavailable origins, and learn what to inspect in deployment logs.

Decode a CDN or gateway error

Paste a captured HTTP response or enter a status and headers. Only the status and response headers are sent; common credential headers are filtered first.

Supports raw headers, full HTTP responses, JSON with status/statusCode and headers, cURL -v/-i response output, and HAR exports. HAR selects a server error first. cURL commands are never executed; request headers, response bodies, and common credential headers are excluded.

Find the cause of the next outage sooner

During an outage, every second counts. SteadyNode's uptime engine translates CDN errors into likely root causes on every check.

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Vercel 504: cause and troubleshooting

A Vercel function or upstream request exceeded its execution time limit before producing a response.

What to check next

Inspect function logs and traces, reduce synchronous work, optimize external calls, and move durable long-running work into a background processing system.

Use the diagnostic code and provider headers as clues, then confirm the request against origin logs and deployment telemetry. A status code can be generated by a proxy, load balancer, function platform, or origin application; the same number does not always have the same cause across providers.

Keep a CDN error from becoming a long outage

Record the request identifier, timestamp, affected hostname, and deployment when investigating an intermittent failure. SteadyNode checks public endpoints on a schedule and translates recognized upstream errors into concise diagnostic context, helping teams identify whether a failure is at the edge or origin.

Frequently asked questions

What causes a Vercel 504?

A 504 can occur when a function or its upstream dependency does not respond before the platform's request deadline.

What does FUNCTION_INVOCATION_TIMEOUT mean?

It identifies a serverless function invocation that exceeded its configured execution time limit.