HTTP status codes

Every HTTP status code with a plain explanation and when to use it.

Class
Codes

Informational: the request was received, keep going

Success: the request worked

Redirection: look somewhere else

Client error: the request has a problem

Server error: the server failed

Details

100Continue

Informational: the request was received, keep going

What it means

The server got the request headers and the client can send the body.

When to use it

Sent in reply to Expect: 100-continue, so a client can check before uploading a large body.

Defined in
RFC 9110
Registered
Yes, in the IANA registry

Codes marked non-standard aren't in the IANA registry; they come from servers and services such as nginx and Cloudflare.

93 codes
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