HTTP Status Codes Reference

Server has received request headers; client should proceed with body

Server agrees to switch protocol (e.g. HTTP to WebSocket)

Server is processing request; may take a while

Preload hints before final response

Resumable uploads supported (temporary registration)

Request succeeded; response body contains resource

Resource created; Location header may contain new URL

Request accepted for processing but not yet completed

Success but response is from cache/transform (not origin)

Success; no body to return

Success; client should reset document view

Partial content; Range header was used

Multiple status codes for batch/collection

Members already enumerated (WebDAV)

Instance manipulation applied (delta encoding)

Multiple representations available; client or server chooses

Resource permanently moved; use new URL for future requests

Temporary redirect; use original URL for future requests

Redirect to different URI via GET

Cached version still valid; no body sent

Request must be sent via proxy (deprecated)

Temporary redirect; preserve request method

Permanent redirect; preserve request method

Request malformed or invalid syntax

Authentication required; missing or invalid credentials

Payment required (reserved for future use)

Server understood request but refuses to fulfill it

Resource not found at this URL

HTTP method not allowed for this resource

No representation matches Accept headers

Client must authenticate with proxy

Server timed out waiting for request

Request conflicts with current state (e.g. version conflict)

Resource permanently removed; no redirect

Content-Length header required

Condition in request headers failed

Request body exceeds server limit

Request URI exceeds server limit

Request body format not supported

Range header cannot be satisfied

Expect header cannot be met

Server refuses to brew coffee (RFC 2324 April Fools)

Request sent to server unable to produce response

Request well-formed but semantically invalid

Resource locked (WebDAV)

Request failed due to failure of prior request (WebDAV)

Server unwilling to process request (replay risk)

Client should switch to different protocol

Conditional request required

Rate limit exceeded; retry after delay

Headers exceed server limit

Resource blocked for legal reasons (e.g. geo-block)

Generic server error; request could not be fulfilled

Server does not support the functionality

Invalid response from upstream server

Server temporarily unavailable (overload, maintenance)

Upstream server did not respond in time

HTTP version not supported

Transparent content negotiation error

Server out of space (WebDAV)

Infinite loop in request processing (WebDAV)

Client must authenticate to access network