SteadyNode

AWS CloudFront HTTP 502

What does AWS CloudFront error 502 mean?

Decode AWS CloudFront 502 errors, check origin response validity, TLS configuration, and the request path between CloudFront and the origin.

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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AWS CloudFront 502: cause and troubleshooting

The CloudFront origin returned an invalid or incomplete response, or CloudFront could not complete its connection to the origin.

What to check next

Inspect origin logs, verify the origin protocol and TLS certificate, and confirm the response is valid HTTP with headers that meet CloudFront limits.

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 CloudFront 502?

CloudFront 502 responses commonly indicate an invalid origin response or a failed connection or TLS handshake to the origin.

Where should I look for a CloudFront 502?

Check the CloudFront request ID, distribution origin settings, origin TLS logs, and application logs for the matching request.