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HTTP Status Codes

Status code classes partition outcomes: 2xx success (200 OK, 201 Created, 204 No Content), 4xx client fault (400 validation, 401 unauthenticated, 403 forbidden, 404 missing, 429 throttled), 5xx server fault. The distinction between 401 and 403 encodes whether identity or authorization failed.

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HTTP Status Codes Explained

HTTP status codes are a standardized three-digit signaling mechanism by which a server communicates the outcome of a request to a client, with the first digit indicating a categorical class of outcom…