1. Common request methods

Delete, options, put, patch, get, post

2.Response code

100 The server received the request and the user needs to continue to operate, for example: a request is made, but the user needs to continue to enter the password

101 Convert the protocol according to client requirements
200 The request is successful, the server successfully processed the request

202 Request has been accepted, but has not been processed
300 Request Redirect

303 The corresponding current demand needs to be found in another url address, which address the client accesses through the get request method

400 Client Error

403 The server understood the request, but rejected the user's request, CSRF
404 Page not found
500 Server error

502 bad gateway server error, there is a problem with the proxy
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