1xx - Informational
- Request received, continuing process.
- Example:
100 Continue.
2xx - Success
- The request was successfully received, understood, and accepted.
- Common examples:
- 200 OK — Standard response for successful requests (GET, PUT, PATCH, DELETE).
- 201 Created — The request was successful and a new resource was created (POST).
3xx - Redirection
- Further action needs to be taken to complete the request.
- Example:
- 301 Moved Permanently — Resource has been permanently moved to a new URL.
4xx - Client Error
- The request contains bad syntax or cannot be fulfilled.
- Common examples:
- 400 Bad Request — The server could not understand the request.
- 401 Unauthorized — Authentication is needed or failed.
- 403 Forbidden — Server understood the request but refuses to authorize it.
- 404 Not Found — The server cannot find the requested resource.
5xx - Server Error
- The server failed to fulfill a valid request.
- Common examples:
- 500 Internal Server Error — The server encountered an unexpected condition.
- 502 Bad Gateway — Server received an invalid response from an upstream server.
- 503 Service Unavailable — The server is currently unavailable (overloaded or down for maintenance).
Notes:
- 2xx means "successful operation."
- 4xx errors are the client's fault (bad input, missing authentication, etc.).
- 5xx errors are the server's fault (server crash, bug, or overload).
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