Cheat Sheet

HTTP Status Codes

Condensed status code meanings for quick debugging.

1xxInformational

100Continue · Headers accepted, continue request body.
101Switching Protocols · Protocol upgrade accepted.
103Early Hints · Preload hints before final response.

2xxSuccess

200OK · Request succeeded.
201Created · Resource created.
204No Content · Success without body.

3xxRedirection

301Moved Permanently · Permanent redirect.
302Found · Temporary redirect.
304Not Modified · Use cached representation.
307Temporary Redirect · Redirect, preserve method.
308Permanent Redirect · Permanent redirect, preserve method.

4xxClient Error

400Bad Request · Malformed request.
401Unauthorized · Auth required.
403Forbidden · Access denied.
404Not Found · Resource not found.
429Too Many Requests · Rate limit exceeded.

5xxServer Error

500Internal Server Error · Unexpected server failure.
502Bad Gateway · Invalid upstream response.
503Service Unavailable · Service unavailable.
504Gateway Timeout · Upstream timeout.

howhttpworks.com/resources/cheat-sheets/status-codes