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HTTP status codes are a set of standardized and agreed upon numbers that identify information about an http response. Status codes are 3 digits and broken down into 5 categories, each organized by the first digit of the number. A successful request doesn't always mean the same thing from a user perspective. 404 is used when the requested resource can't be found and there is no redirect provided. 401 is for clients that are known to the server, but don't have proper permissions to access a resource. 401 (Unauthorized) 401 is used because of invalid credentials. 429 is when you hit the rate-limit by sending too many requests over a period of time.
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