dev.to

HTTP Status Codes Cheat Sheet

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). If you found this helpful, consider supporting my work at ☕ Buy Me a Coffee.

Apr 28, 2025 - 09:33

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).

If you found this helpful, consider supporting my work at ☕ Buy Me a Coffee.