HTTP Status Codes

Server received request headers, client should proceed to send body

Server is switching protocols as requested by client

Server is processing the request but no response is available yet

Used to preload resources while server prepares response

Request succeeded. Standard response for successful HTTP requests

Request succeeded and a new resource was created

Request accepted for processing but not yet completed

Response from a transforming proxy, not from origin server

Request succeeded but no content to return

Request succeeded, client should reset the document view

Server delivering only part of the resource (Range header)

Multiple status codes for multiple operations (WebDAV)

Members of a DAV binding already enumerated (WebDAV)

Server fulfilled request with instance-manipulations applied

Multiple options for the resource, client should choose

Resource has been permanently moved to new URL

Resource temporarily at different URL

Response to request can be found at another URL using GET

Resource not modified since last request (caching)

Deprecated. Resource must be accessed through a proxy

Temporary redirect, same method must be used

Permanent redirect, same method must be used

Server cannot process request due to client error

Authentication required. Invalid or missing credentials

Reserved for future use, sometimes used for payment APIs

Server understands request but refuses to authorize it

Requested resource could not be found on server

HTTP method not supported for this resource

Resource not available in format accepted by client

Client must authenticate with proxy first

Server timed out waiting for the request

Request conflicts with current state of the resource

Resource is no longer available and will not return

Content-Length header required for this request

One or more conditions in request headers failed

Request body exceeds server limits

Request URI exceeds server limits

Media type in request not supported by server

Requested range cannot be provided by server

Server cannot meet Expect header requirements

April Fools joke. Server refuses to brew coffee with a teapot

Request was directed at a server unable to respond

Request well-formed but semantically erroneous

Resource is currently locked (WebDAV)

Request failed due to failure of previous request (WebDAV)

Server unwilling to risk processing a replayed request

Client should switch to different protocol

Server requires conditional request headers

User sent too many requests (rate limiting)

Header fields exceed server limits

Resource blocked for legal reasons (censorship)

Generic server error, something went wrong

Server does not support the functionality required

Server acting as gateway received invalid response

Server temporarily unavailable (overload or maintenance)

Server acting as gateway did not receive timely response

Server does not support HTTP version used in request

Transparent content negotiation error

Server unable to store representation (WebDAV)

Server detected infinite loop processing request (WebDAV)

Further extensions to request are required

Client must authenticate to gain network access