100 Continue Continue. Generally, when sending a post request, the server will return this message after the http header has been sent to indicate confirmation, and then send specific parameter information.
2xx: success status code
200 OK Normal return message
201 Created request was successful and the server created a new resource
202 Accepted The server has accepted the request, but has not yet processed it
3xx redirect
301 Moved Permanently The requested file has been permanently moved to a new location.
302 Found temporary redirection.
303 See Other Temporary redirect, and always use GET to request a new URI.
304 Not Modified Since the last request, the requested file has not been modified.
4xx: client error
400 Bad Request The server cannot understand the format of the request, and the client should not try to use the same content to initiate the request again.
401 Unauthorized The request is not authorized.
403 Forbidden Access is forbidden.
404 Not Found Can not find how to match the resource with the URI. (404 is our most, most, most, most common, and most common webpage error. In fact, it simply means that resources cannot be found).
5XX: server error
500 Internal Server Error The most common server-side error.
503 Service Unavailable The server is temporarily unable to process the request (may be overloaded or maintained).
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