Overview:
The ones starting with 2 indicate that the server has received the browser (client) request (of course, there are many cases for subsequent processing). The ones starting with 3 indicate
that the resource is transferred. The browser (client) requests the
one starting with 5. The server (backend) mistake
1、200
successful request
2、201
succeeded and created a new resource
3、202
The request was received but not yet processed
4、204
The server processed successfully, but did not return any content. If the webpage is not updated, the browser displays the same content
5、301
The requested resource is permanently moved and the browser is automatically directed to the new URI
6、302
The requested resource is temporarily moved, and the browser continues to use the original URI
7、400
Request syntax error
8、401
The request requires user authentication
9、403
The server understands the client's request, but refuses to execute it (probably because the identity authentication has not passed)
10、404
Could not find resource or page
11、408
Request timed out
12、411
The request has no request information with Content-Length
13、415
The server cannot handle the media format attached to the request
14、500
internal server error