100 Some actions the client responds to
200 means the request was successful
301 The requested resource is redirected forever Moved Permanently
For example, convert http://www.baidu.com to https://www.baidu.com
Or change the name of the web page, this process will also redirect
It's like you moved, the old house is not yours anymore
302 is used to make a temporary jump
For example, if the user is not logged in but wants to visit the user center, the lesson will transfer the user to the login page
304 Negotiate Cache
This article is very detailed
https://www.cnblogs.com/wonyun/p/5524617.html
307 hsts jump
4xx means client request error
5xx means server error