HTTP status code and its meaning

When writing the front-end features, it is inevitable that the backend we send the request, to get some data, this time the back-end returns a response status code for us, to know this status code can help us better understand the server data returned by the state, the following are some of the common I read data query to status code information for your reference:

1XX: indicates the information status code

100 the Continue to Continue

Generally, when sending a POST request, the server sends an acknowledgement message after the HTTP header is sent, and then sends specific parameter information

2XX: success status code

200 OK

Normal return message

201 Created

The request succeeds and the server creates a new resource

202 Accepted

The server has accepted the request but has not yet processed it

3XX: redirection

301 Moved Permanently

The requested page has been permanently moved to the new location.

302 Found

Temporary redirection.

303 See Other

Temporary redirects, and always requests new URIs using GET.

304 Not Modified

The requested page has not been modified since the last request.

4XX: Client error

400 Bad Request

The server does not understand the format of the request, and the client should not attempt to initiate the request again with the same content.

401 Unauthorized

Request is not authorized.

403 Forbidden

Access is prohibited.

404 Not Found

Could not find resource how to match URI.

5XX: Server error

500 Internal Server Error

The most common server-side errors.

503 Service Unavailable

The server side is temporarily unable to process the request (possibly due to overload or maintenance).