HTTP Status Messages

HTTP Status Messages (状态消息)

The users may get an error while sending a request to a server. Definitely, the user has seen such messages frequently. (用户向服务器发送请求时可能出错。毫无疑问,用户经常看到此类消息。)

Here you can find the list of Hypertext Transfer Protocol (HTTP) response status codes. These codes are used to respond to the request of the client made to the server. There are 5 classes of HTTP response status codes. Let’s go through each class:

If you receive a response that is not included in this list, this means that it is a non-standard response, perhaps custom to the software of the server. (>如果您收到的响应未包含在此列表中,这意味着这是一个非标准响应,可能是针对服务器软件的自定义响应。)

1xx: Information

1xx: Information

Status codeMessageDescription
100ContinueMeans that the server has received request headers and the client should continue to send request body.
101Switching ProtocolsMeans that the client, who made a request, has asked the server to change protocols.
103CheckpointMeans that it is used in the resumable requests proposal to resume aborted PUT or POST requests.

2xx: Successful

2xx: Successful

Status codeMessageDescription
200OKMeans that the request is OK. It is standard response for successful HTTP requests.
201CreatedMeans that the request has been fulfilled and a new resource is created.
202AcceptedMeans that the request has been accepted for processing, but the processing is going on.
203Non-Authoritative InformationMeans that the request has been successfully processed, but it is returning information which may be from another source.
204No ContentMeans that the request has been successfully processed, but it is not giving any content.
205Reset ContentMeans that the request has been processed, but it is not returning any content and it requires that the requester reset the document view.
206Partial ContentMeans that the server commits only a part of the resource, because of a range header, which was sent by the client.

3xx: Redirection

3xx: Redirection

Status codeMessageDescription
300Multiple ChoicesIs a link list which means that the user can select a link and go there. It can contain maximum five addresses.
301Moved PermanentlyMeans that the page has been moved to a new URL.
302FoundMeans that the requested page has been moved to a new URL temporarily.
303See OtherMeans that the requested page can be found in another URL.
304Not ModifiedMeans that the requested page hasn’t been modified since the last request.
306Switch ProxyIs not used anymore.
307Temporary RedirectMeans that the requested page has been moved to a new URL temporarily.
308Resume IncompleteIs used in resumable requests proposal to continue aborted PUT or POST requests.

4xx: Client Error

4xx: Client Error

Status codeMessageDescription
400Bad RequestMeans that the request can be fulfilled because of the bad syntax.
401UnauthorizedMeans that the request was legal, but the server is rejecting to answer it. For the use when authentication is required and has failed or has not yet been provided.
402Payment RequiredIs reserved for a future use.
403ForbiddenMeans that the request is legal, but the server is rejecting to answer it.
404Not FoundMeans that the requested page cannot be found at the moment, but it may be available again in the future.
405Method Not AllowedMeans that the request was made of a page that uses an unsupported request method for that page.
406Not AcceptableMeans that the server can only generate an answer which the client doesn’t accept.
407Proxy Authentication RequiredMeans that the client first authenticate itself with the proxy.
408Request TimeoutMeans that the server timed out waiting for the request.
409ConflictMeans that the request cannot be completed, because of a conflict in the request.
410GoneMeans that the requested page is not available anymore.
411Length RequiredMeans that the content length is not defined and the server won’t accept the request without it.
412Precondition FailedMeans that precondition, which is given in the request, is evaluated to false by the server.
413Request Entity Too LargeMeans that the request entity is too large and that’s why the server won’t accept the request.
414Request-URI Too LongMeans that the URL is too long and that’s why the server won’t accept the request. It happens when you convert a POST request to a GET request with a long query information.
415Unsupported Media TypeMeans that the media type is not supported and that’s why the server won’t accept the request.
416Requested Range Not SatisfiableMeans that the client asked for a part of the file but the server cannot supply that part.
417Expectation FailedMeans that the server cannot meet the requirements of the expected request header field.

5xx: Server Error

5xx: Server Error

Status codeMessageDescription
500Internal Server ErrorIs a generic error and users receive this error message when there is no more suitable specific message.
501Not ImplementedMeans that the server doesn’t recognize the request method or it lacks the ability to fulfill the request.
502Bad GatewayMeans that the server was acting as a gateway or proxy and it received an invalid answer from the upstream server.
503Service UnavailableMeans that the server is not available now (It may be overloaded or down).
504Gateway TimeoutMeans that the server was acting as a gateway or proxy and it didn’t get answer on time from the upstream server.
505HTTP Version Not SupportedMeans that the HTTP protocol version, used in the request, is not supported by the server.
511Network Authentication RequiredMeans that the client needs to authenticate to gain network access.


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