| 100 | ContinueThe server has received the initial part of the request and the client should continue. |
| 101 | Switching ProtocolsThe requester has asked the server to switch protocols and the server has agreed. |
| 102 | ProcessingServer has received and is processing the request, but no response is available yet. |
| 103 | Early HintsUsed to return some response headers before final HTTP message. |
| 200 | OKThe request succeeded. The meaning depends on the HTTP method. |
| 201 | CreatedThe request succeeded and a new resource was created. |
| 202 | AcceptedThe request has been accepted for processing but hasn't been completed. |
| 203 | Non-Authoritative InformationThe returned metadata is not the exact set available from the origin server. |
| 204 | No ContentThe server successfully processed the request with no content to return. |
| 205 | Reset ContentThe server instructs the client to reset the document view. |
| 206 | Partial ContentThe server is returning partial data due to a range header. |
| 207 | Multi-StatusMultiple status codes for a single request. |
| 208 | Already ReportedThe members of a DAV binding have already been enumerated. |
| 226 | IM UsedThe server has fulfilled a GET request for the resource. |
| 300 | Multiple ChoicesThere are multiple options for the resource. |
| 301 | Moved PermanentlyThe resource has been moved permanently to a new URL. |
| 302 | FoundThe resource is temporarily located at a different URL. |
| 303 | See OtherThe response can be found at a different URL using GET. |
| 304 | Not ModifiedThe resource has not been modified since the last request. |
| 305 | Use ProxyThe requested resource must be accessed through a proxy. |
| 307 | Temporary RedirectThe request should be repeated with the same method at a different URL. |
| 308 | Permanent RedirectThe request and all future requests should be repeated at a new URL. |
| 400 | Bad RequestThe server cannot process the request due to client error. |
| 401 | UnauthorizedAuthentication is required and has failed or not been provided. |
| 402 | Payment RequiredReserved for future use. Originally intended for digital payment systems. |
| 403 | ForbiddenThe server understood the request but refuses to authorize it. |
| 404 | Not FoundThe requested resource could not be found on the server. |
| 405 | Method Not AllowedThe request method is not supported for the requested resource. |
| 406 | Not AcceptableThe server cannot produce a response matching the accept headers. |
| 407 | Proxy Authentication RequiredProxy authentication is required. |
| 408 | Request TimeoutThe server timed out waiting for the request. |
| 409 | ConflictThe request conflicts with the current state of the server. |
| 410 | GoneThe resource is no longer available and has been permanently removed. |
| 411 | Length RequiredThe server requires a content-length header in the request. |
| 412 | Precondition FailedA precondition in the request headers evaluated to false. |
| 413 | Payload Too LargeThe request entity is larger than the server is willing to process. |
| 414 | URI Too LongThe request URL is longer than the server is willing to interpret. |
| 415 | Unsupported Media TypeThe media format of the request is not supported. |
| 416 | Range Not SatisfiableThe range specified in the range header cannot be fulfilled. |
| 417 | Expectation FailedThe expectation given in the expect header cannot be met. |
| 418 | I'm a teapotThe server refuses to brew coffee in a teapot. |
| 421 | Misdirected RequestThe request was directed at a server that is not able to produce a response. |
| 422 | Unprocessable EntityThe request was well-formed but was unable to be followed due to semantic errors. |
| 423 | LockedThe resource that is being accessed is locked. |
| 424 | Failed DependencyThe request failed due to failure of a previous request. |
| 425 | Too EarlyThe server is unwilling to risk processing a request that might be replayed. |
| 426 | Upgrade RequiredThe server requires the client to upgrade to a different protocol. |
| 428 | Precondition RequiredThe server requires the request to be conditional. |
| 429 | Too Many RequestsThe user has sent too many requests in a given amount of time. |
| 431 | Request Header Fields Too LargeThe request headers are too long to process. |
| 451 | Unavailable For Legal ReasonsThe server is denying access due to legal reasons. |
| 500 | Internal Server ErrorA generic error message when an unexpected condition occurred. |
| 501 | Not ImplementedThe server does not support the functionality required to fulfill the request. |
| 502 | Bad GatewayThe server was acting as a gateway and received an invalid response. |
| 503 | Service UnavailableThe server is currently unavailable due to overload or maintenance. |
| 504 | Gateway TimeoutThe server was acting as a gateway and did not respond in time. |
| 505 | HTTP Version Not SupportedThe HTTP version used in the request is not supported. |
| 506 | Variant Also NegotiatesThe server has an internal configuration error. |
| 507 | Insufficient StorageThe server has insufficient storage to complete the request. |
| 508 | Loop DetectedThe server detected an infinite loop while processing the request. |
| 510 | Not ExtendedFurther extensions are required to fulfill the request. |
| 511 | Network Authentication RequiredThe client needs to authenticate to gain network access. |