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HTTP Status Codes

Every server response tells a story. Decode the meaning behind 404s, 500s, and every other HTTP status code.

3xx Errors

301

301 Moved Permanently

The requested resource has been assigned a new permanent URI.

4xx Errors

403

403 Forbidden

The server understands the request but refuses to authorize it.

404

404 Not Found

The server cannot find the requested resource.

5xx Errors

500

500 Internal Server Error

The generic 'catch-all' error when the server encounters an unexpected condition.

502

502 Bad Gateway

The server received an invalid response from an inbound server it was accessing while acting as a gateway or proxy.

503

503 Service Unavailable

The server is currently unable to handle the request due to a temporary overload or scheduled maintenance.

504

504 Gateway Timeout

The server, acting as a gateway, did not receive a timely response from an upstream server.