HTTP Status Code Reference
2xx Success
The request has succeeded.
The request succeeded and a new resource has been created.
The request succeeded but there is no content to return.
3xx Redirection
The requested resource has been permanently moved to a new URL.
The requested resource has been temporarily moved to a different URL.
4xx Client Errors
The server could not understand the request due to invalid syntax.
Authentication is required and has failed or was not provided.
The server understood the request but refuses to authorize it.
The server can not find the requested resource.
The request conflicts with the current state of the target resource.
The user has sent too many requests in a given amount of time.
5xx Server Errors
The server encountered an unexpected condition that prevented it from fulfilling the request.
The server received an invalid response from an upstream server.
The server is not ready to handle the request, often due to overload or maintenance.