What is the difference between 401 and 403?

401 Unauthorized means no valid credentials were provided. 403 Forbidden means the client is authenticated but lacks permission to access the resource.

Should I use 301 or 308 for permanent redirects?

301 may cause browsers to change POST to GET. 308 preserves the original HTTP method. Use 308 when method preservation matters.

When should I use 400 vs 422?

400 Bad Request is for malformed syntax or missing required fields. 422 Unprocessable Content is for syntactically valid requests with semantic errors like invalid field values.

What is the difference between 302 and 307?

302 Found may cause browsers to change POST to GET. 307 Temporary Redirect preserves the original HTTP method. Use 307 for method-safe temporary redirects.

When should I return 204 vs 200?

200 OK returns a response body. 204 No Content signals success with no body — ideal for DELETE or PUT operations where no data needs to be returned.

Tools

HTTP Status Code Picker

Which status code should this response have? Answer two or three questions, or search all 80 codes by number, name or situation, and get the code with when to use it.

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What happened with the request?

Status code classes

1xx Informational.: Request received, processing continues. 100 Continue, 101 Switching Protocols.
2xx Success.: Received, understood and accepted. 200 OK, 201 Created, 204 No Content.
3xx Redirection.: Further action needed. 301 Moved Permanently, 302 Found, 307 Temporary Redirect.
4xx Client error.: The request has a problem. 400 Bad Request, 401 Unauthorized, 404 Not Found.
5xx Server error.: The server failed. 500 Internal Server Error, 502 Bad Gateway, 503 Service Unavailable.

Browse all HTTP status codes, compare 401 vs 403 or 301 vs 302, or try the HTTP Playground.