200 Success Code
The standard response for successful HTTP requests. The actual response will be determined by the method of request used. For a GET request, the response will contain an entity that corresponds to the requested resource. In a POST request, the response will include an entity that describes or contains the action’s result.
201 Created Code
The request was granted, and a new resource was generated as a result. The URI(s) returned in the entity of the response can be used to refer to the newly generated resource, with the most particular URI for the resource provided via a Location header field.
202 Accepted Code
This indicates the the request to load the website has been accepted, but has yet to fully be processed.
204 No Content Code
The HTTP 204 No Content success status code indicates that a request was successful but that the client does not need to leave the current page.