HTTP Status Code Reference

OK

The request succeeded.

Created

The request succeeded and a new resource was created.

Accepted

The request was accepted for processing, but isn't complete yet.

No Content

The request succeeded, no content to return.

Moved Permanently

The resource has permanently moved to a new URL.

Found

The resource temporarily lives at a different URL.

Not Modified

The cached version is still valid, no need to re-fetch.

Temporary Redirect

Like 302, but guarantees the method and body are not changed on redirect.

Permanent Redirect

Like 301, but guarantees the method and body are not changed on redirect.

Bad Request

The server can't process the request due to a client error (malformed syntax, invalid data).

Unauthorized

Authentication is required and has failed or not been provided.

Forbidden

The server understood the request but refuses to authorize it - unlike 401, re-authenticating won't help.

Not Found

The server can't find the requested resource.

Method Not Allowed

The HTTP method used isn't supported for this resource.

Conflict

The request conflicts with the current state of the resource.

Unprocessable Entity

The request is well-formed but contains semantic errors.

Too Many Requests

Rate limit exceeded - the client should back off before retrying.

Internal Server Error

A generic error occurred on the server.

Bad Gateway

The server, acting as a gateway, got an invalid response from the upstream server.

Service Unavailable

The server is temporarily unable to handle the request (overloaded or down for maintenance).

Gateway Timeout

The server, acting as a gateway, didn't get a response in time from the upstream server.