HTTP Status Codes

Server received request headers, client should proceed

Server agrees to switch protocol

Request succeeded

Resource created successfully

Request succeeded, no content to return

Resource permanently moved to new URL

Resource temporarily at different URL

Resource not modified since last request

Server cannot process due to client error

Authentication required

Server refuses to fulfill request

Resource not found

HTTP method not allowed for this resource

Request conflicts with current state

Request well-formed but semantically invalid

Rate limit exceeded

Unexpected server error

Invalid response from upstream server

Server temporarily unavailable

Upstream server timed out