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HTTP status codes

What each code means, and whether you should hear about it. Free, no signup.

1xx

Code	Name	Alert?
100	Continue	No
101	Switching Protocols	No
103	Early Hints	No

2xx

Code	Name	Alert?
200	OK	No
201	Created	No
202	Accepted	Usually no
204	No Content	No

3xx

Code	Name	Alert?
301	Moved Permanently	No
302	Found	Usually no
304	Not Modified	No
307	Temporary Redirect	Usually no
308	Permanent Redirect	No

4xx

Code	Name	Alert?
400	Bad Request	Usually no
401	Unauthorized	Usually no
403	Forbidden	Usually no
404	Not Found	Usually no
405	Method Not Allowed	Usually no
408	Request Timeout	Usually no
409	Conflict	Usually no
410	Gone	Usually no
413	Content Too Large	Usually no
415	Unsupported Media Type	Usually no
422	Unprocessable Content	Usually no
429	Too Many Requests	Yes

5xx

Code	Name	Alert?
500	Internal Server Error	Yes
501	Not Implemented	Usually no
502	Bad Gateway	Yes
503	Service Unavailable	Yes
504	Gateway Timeout	Yes
505	HTTP Version Not Supported	Usually no

30 codes. Each page says when to retry and when to alert.