Different Http Status code in rest api spring boot app ?

1xx: Informational
These codes indicate that the request was received and understood, and the client should continue the request or ignore it if it is already finished.
100 Continue: The initial part of a request has been received and has not yet been rejected by the server.
101 Switching Protocols: The server is switching protocols as requested by the client.
102 Processing: The server has received and is processing the request, but no response is available yet.
2xx: Success
These codes indicate that the action requested by the client was received, understood, accepted, and processed successfully.
200 OK: The request has succeeded. The meaning of the success depends on the HTTP method:
GET: The resource has been fetched and transmitted in the message body.
POST: The resource describing the result of the action is transmitted in the message body.
201 Created: The request has been fulfilled and has resulted in the creation of a new resource.
202 Accepted: The request has been accepted for processing, but the processing has not been completed.
203 Non-Authoritative Information: The request was successful but the information in the response is from a local or third-party copy.
204 No Content: The server successfully processed the request, but is not returning any content.
205 Reset Content: The server successfully processed the request, but is not returning any content and requires that the requester reset the document view.
206 Partial Content: The server is delivering only part of the resource due to a range header sent by the client.
3xx: Redirection
These codes indicate that further action needs to be taken by the user agent to fulfill the request.
300 Multiple Choices: There are multiple options for the resource that the client may follow.
301 Moved Permanently: The resource has been moved permanently to a new URI.
302 Found: The resource has been temporarily moved to a different URI.
303 See Other: The response can be found under another URI using a GET method.
304 Not Modified: The resource has not been modified since the version specified by the request headers.
307 Temporary Redirect: The resource has been temporarily moved to a different URI and the client should use the original URI for future requests.
308 Permanent Redirect: The resource has been permanently moved to a different URI and the client should use the new URI for future requests.
4xx: Client Error
These codes indicate that the client seems to have made an error.
400 Bad Request: The server cannot or will not process the request due to a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).
401 Unauthorized: The request requires user authentication.
402 Payment Required: Reserved for future use.
403 Forbidden: The server understood the request but refuses to authorize it.
404 Not Found: The server can't find the requested resource.
405 Method Not Allowed: The request method is not supported for the requested resource.
406 Not Acceptable: The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request.
407 Proxy Authentication Required: The client must first authenticate itself with the proxy.
408 Request Timeout: The server timed out waiting for the request.
5xx: Server Error
These codes indicate that the server failed to fulfill a valid request.
500 Internal Server Error: The server encountered an unexpected condition that prevented it from fulfilling the request.
501 Not Implemented: The server does not support the functionality required to fulfill the request.
502 Bad Gateway: The server received an invalid response from the upstream server.
503 Service Unavailable: The server is currently unable to handle the request due to temporary overloading or maintenance of the server.
504 Gateway Timeout: The server did not receive a timely response from the upstream server.
505 HTTP Version Not Supported: The server does not support the HTTP protocol version used in the request.