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HTTP of TCP/IP

Shulou Source: shulou.com Published: 2022-06-01 03:32:28 10月03日 Update

HTTP:HyperText Transfer Protocol Hypertext transfer Protocol

Features: dumb service, non-stateless connectionless service

URL= protocol + host+ [port] + URI

HttpRequest:

Remove the first line (CRLF represents carriage return and line feeds) (firewalls can filter based on these fields)

Command:

Commonly used GET HEAD PUT POST

Common status code

200 OK / / client request succeeded

400 Bad Request / / client request has syntax error and cannot be understood by the server

401 Unauthorized / / request unauthorized, this status code must be used with the WWW-Authenticate header domain

403 Forbidden / / server received the request but refused to provide service

404 Not Found / / request resource does not exist. Eg: incorrect URL entered

Unexpected error occurred on 500 Internal Server Error / / server

503 Server Unavailable / / server is currently unable to process client requests and may return to normal after a period of time