About HTTP status Codes

The HTTP status code represents the status of the response returned by the HTTP protocol. For example, the client sends a request to the server, and if the requested resource is successfully obtained, the returned status code is 200, indicating the corresponding success. If the requested resource does not exist, a 404 error is typically returned.

HTTP status codes are usually divided into 5 types, which begin with the five digits of the number, and consist of a 3-bit integer. 1XX is usually used for experimental purposes. This chapter mainly introduces 2xx, 3xx, 4xx, 5xx and other common status codes.

Status code	Code description	Processing mode
200	Request succeeded	Get the content of the response for processing
201	The request is complete and the result is a new resource is created.	The URI of the newly created resource can be obtained in the response entity
202	The request was accepted, but the processing was not completed.	Blocking wait.
204	The server side has implemented the request, but no new information is returned. If the client is a user agent, you do not need to update your own document view for this	Discarded
300	The status code is not used directly by the http/1.0 application, only as the default interpretation of the 3xx type response. There are multiple requested resources available.	If the program can be processed, then further processing, if the program can not be processed, then discarded.
301	The requested resource is assigned a permanent URL, so that the resource can be accessed in the future through that URL.	Redirects to the assigned URL.
60W	The requested resource is temporarily stored at a different URL	Redirect to a temporary URL
304	The requested resource is not updated	Discarded
400	Illegal request	Discarded
401	Not authorized	Discarded
403	Ban	Discarded
404	Not found	Discarded
5xx	A status code that begins with "5" in the response code indicates that the server side found itself with an error and cannot proceed with the request	Discarded

When the returned status code is 5XX, on behalf of the application Server error, with simple discard processing can be resolved.

About HTTP status Codes