Bad Request

This response indicates that the server could not understand the request due to invalid syntax. It is typically triggered by client-side input errors such as improperly formatted requests, missing required fields, or invalid data values.

Not Found

This response indicates that the requested resource could not be found on the server. It typically occurs when no resource matches the requested URI, or the resource identifier used in the request does not exist.

Conflict

This response indicates that the request could not be completed due to a conflict with the current state of the target resource. This typically occurs when there are duplicate entries or other data conflicts.