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TypeScript Microservices by Parth Ghiya

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4xx – client errors 

This range of codes is the most well known due to the traditional 404 Not found error, which is a well-known placeholder for URLs that are not properly formed. This range of codes indicates that there is something wrong with the request. Other well-known codes include 400 Bad Request (a request that is syntactically incorrect), 401 Unauthorized (lack of authentication from the client), and 403 Forbidden (the user does not have privileges). Another common code is 429 Too Many Requests, which is used for rate-limiting requests to indicate that traffic from the particular client is rejected.

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