Despite their error, it is still our duty as developers (especially RESTful API developers) to give the client an informative message describing what went wrong. The most common 400-class response ...

Common HTTP status code errors in REST API testing include: 400 Bad Request: Indicates that the request sent by the client is invalid. 401 Unauthorized: Shows that the client needs to authenticate ...

Codes in the 4xx range indicate client errors, such as 404 Not Found for inaccessible resources or 400 Bad Request for invalid data. Similarly, 5xx codes are reserved for server-side issues.

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204: “Done, and no body.” Generally, your DELETEs return this code. 400: “Client sent me junk, and I’m not going to mess with it.” 401: “Unauthorized, the client should authenticate ...

Example: AUTH_ERROR AUTH_INVALID_CREDENTIALS; AUTH_EXPIRED_TOKEN; AUTH_INSUFFICIENT_PERMISSIONS; d. Include a Request Identifier. A Request Identifier, often called a Request ID, is a unique string or ...