HTTP Status Codes

The server has successfully fulfilled the request and that there is no additional content to send in the response payload body. This is sent when the server successfully processed the request, but doesn't need to return any content. Most often, this occurs as the result of a DELETE request. When a 204 request is sent, the user agent (the client or web browser) is specifically not supposed to change its view. For example, if the request was sent via a form on a page, the response should not cause the form to be refreshed or for the browser to visit another page — there is not new content in the request to replace the existing content in the user's view. Metadata in the response header fields refer to the target resource and its selected representation after the requested action was applied. For example, if a 204 status code is received in response to a PUT request and the response contains an ETag header field, then the PUT was successful and the ETag

The request has been received but not yet acted upon. It is non-committal, meaning that there is no way in HTTP to later send an asynchronous response indicating the outcome of processing the request. It is intended for cases where another process or server handles the request, or for batch processing. The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon, as it might be disallowed when processing actually takes place. There is no facility for re-sending a status code from an asynchronous operation such as this. The 202 response is intentionally non-committal. Its purpose is to allow a server to accept a request for some other process (perhaps a batch-oriented process that is only run once per day) without requiring that the user agent's connection to the server persist until the process is completed. The entity returned with this response SHOULD include an indication of the req

The request has been fulfilled and resulted in a new resource being created. The newly created resource can be referenced by the URI(s) returned in the entity of the response, with the most specific URI for the resource given by a Location header field. The response SHOULD include an entity containing a list of resource characteristics and location(s) from which the user or user agent can choose the one most appropriate. The entity format is specified by the media type given in the Content-Type header field. The origin server MUST create the resource before returning the 201 status code. If the action cannot be carried out immediately, the server SHOULD respond with 202 (Accepted) response instead. A 201 response MAY contain an ETag response header field indicating the current value of the entity tag for the requested variant just created. The primary resource created by the request is identified by either a Location header field in the response or, if no Location field