100

Continue

The client continues sending the request.

The server has received the initial part of the request and the client should continue sending the remaining part.

101

Switching Protocols

The protocol should be switched. The target protocol must be more advanced than the source protocol.

For example, the current HTTP protocol is switched to a later version of HTTP.

201

Created

The request has been fulfilled and a new resource has been created.

202

Accepted

The request has been accepted for processing, but the processing has not been completed.

203

Non-Authoritative Information

This request is successful.

204

NoContent

The server has successfully processed the request, but has not returned any content.

The status code is returned in response to an HTTP OPTIONS request.

205

Reset Content

The server has fulfilled the request, but the requester must reset the content.

206

Partial Content

The server has successfully processed a part of the GET request.

300

Multiple Choices

There are multiple options for the location of the requested resource. The response contains a list of resource characteristics and addresses from which a user terminal (such as a browser) can choose the most appropriate one.

301

Moved Permanently

The requested resource has been assigned a new permanent URI, and the new URI is contained in the response.

302

Found

The requested resource resides temporarily under a different URI.

303

See Other

The response to the request can be found under a different URI.

It should be retrieved using a GET or POST method.

304

Not Modified

The requested resource has not been modified. In this case, there is no need to retransmit the resource since the client still has a previously-downloaded copy.

305

Use Proxy

The requested resource must be accessed through a proxy.

306

Unused

The HTTP status code is no longer used.

400

BadRequest

Invalid request.

Do not retry the request before modification.

401

Unauthorized

This status code is returned after the client provides authentication information to indicate that the information is incorrect or invalid.

402

Payment Required

This status code is reserved for future use.

403

Forbidden

The server understands the request, but is refusing to fulfill it.

The server has received and understood the request, but it refused to respond, because the request is set to deny access. Do not retry the request before modification.

404

NotFound

The requested resource cannot be found.

Do not retry the request before modification.

405

MethodNotAllowed

The method specified in the request is not supported by the requested resource.

Do not retry the request before modification.

406

Not Acceptable

The server could not fulfill the request according to the content characteristics of the request.

407

Proxy Authentication Required

This status code is similar to 401, but the client must first authenticate itself with the proxy.

408

Request Time-out

The server timed out waiting for the request.

The client may repeat the request without modifications at any later time.

409

Conflict

The request could not be processed due to a conflict in it.

This status code indicates that the resource the client is attempting to create already exists, or the requested update failed due to a conflict.

410

Gone

The requested resource is no longer available.

The status code indicates that the requested resource has been deleted permanently.

411

Length Required

The server refuses to process the request without a defined Content-Length.

412

Precondition Failed

The server does not meet one of the preconditions that the requester puts on the request.

413

Request Entity Too Large

The request is larger than what a server can process. The server may disable the connection to prevent the client from sending consecutive requests. If the server cannot temporarily process the request, the response will contain a Retry-After header field.

414

Request-URI Too Large

The Request-URI is too long for the server to process.

415

Unsupported Media Type

The server does not support the media type in the request.

416

Requested range not satisfiable

The requested range is invalid.

417

Expectation Failed

The server fails to meet the requirements of the Expect request-header field.

422

UnprocessableEntity

The request is well-formed but cannot be processed due to semantic errors.

429

TooManyRequests

The client has sent an excessive number of requests to the server within a given time (exceeding the limit on the access frequency of the client), or the server has received an excessive number of requests within a given time (beyond its processing capability). In this case, the client should resend the request after the time specified in the Retry-After header of the response has elapsed.

500

InternalServerError

The server can receive but cannot understand the request.

501

Not Implemented

The server does not support the requested function.

502

Bad Gateway

The server was acting as a gateway or proxy and received an invalid request from the remote server.

503

ServiceUnavailable

The requested service is invalid.

Do not retry the request before modification.

504

ServerTimeout

The request cannot be fulfilled within a given time. This status code is only returned to the client when the Timeout parameter is specified in the request.

505

HTTP Version not supported

The server does not support the HTTP protocol version used in the request.