Saturday 8 September 2018


This is a list of Hypertext Transfer Protocol (HTTP) response status codes.

Success (2XX)
This class of status codes indicates the action requested by the client was received, understood, accepted, and processed successfully.

·         200 OK :
The request has succeeded. The meaning of a success varies depending on the HTTP method:
GET: The resource has been fetched and is transmitted in the message body.
HEAD: The entity headers are in the message body.
PUT or POST: The resource describing the result of the action is transmitted in the message body.
TRACE: The message body contains the request message as received by the server
·         202 Accepted :
The request has been received but not yet acted upon. It is non-committal, meaning that there is no way in HTTP to later send an asynchronous response indicating the outcome of processing the request. It is intended for cases where another process or server handles the request, or for batch processing. 
·         203 Non-Authoritative Information :
This response code means returned meta-information set is not exact set as available from the origin server, but collected from a local or a third party copy. Except this condition, 200 OK response should be preferred instead of this response. 
·         204 No Content :
There is no content to send for this request, but the headers may be useful. The user-agent may update its cached headers for this resource with the new ones.


Redirection (3XX)
This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection.

·         301 Moved Permanently :
This response code means that the URI of the requested resource has been changed. Probably, the new URI would be given in the response.

·         302 Found :
This response code means that the URI of requested resource has been changed temporarily. New changes in the URI might be made in the future. Therefore, this same URI should be used by the client in future requests.

·         304 Not Modified :
This is used for caching purposes. It tells the client that the response has not been modified, so the client can continue to use the same cached version of the response.

·         305 Use Proxy :
Was defined in a previous version of the HTTP specification to indicate that a requested response must be accessed by a proxy. It has been deprecated due to security concerns regarding in-band configuration of a proxy.
·         306 unused :
This response code is no longer used, it is just reserved currently. It was used in a previous version of the HTTP 1.1 specification.

·         307 Temporary Redirect :
The server sends this response to direct the client to get the requested resource at another URI with same method that was used in the prior request. This has the same semantics as the 302 Found HTTP response code, with the exception that the user agent must not change the HTTP method used: If a POST was used in the first request, a POST must be used in the second request.

·         308 Permanent Redirect :
This means that the resource is now permanently located at another URI, specified by the Location: HTTP Response header. This has the same semantics as the 301 Moved Permanently HTTP response code, with the exception that the user agent must not change the HTTP method used: If a POST was used in the first request, a POST must be used in the second request.

Client error (4XX)
The 4xx class of status codes is intended for situations in which the client seems to have erred.

·         400 Bad Request :
This response means that server could not understand the request due to invalid syntax.

·         401 Unauthorized :
Although the HTTP standard specifies "unauthorized", semantically this response means "unauthenticated". That is, the client must authenticate itself to get the requested response.

·         403 Forbidden :
The client does not have access rights to the content, i.e. they are unauthorized, so server is rejecting to give a proper response. Unlike 401, the client's identity is known to the server.

·         404 Not Found :
The server cannot find the requested resource. In the browser, this means the URL is not recognized. In an API, this can also mean that the endpoint is valid but the resource itself does not exist. Servers may also send this response instead of 403 to hide the existence of a resource from an unauthorized client. This response code is probably the most famous one due to its frequent occurrence on the web.

·         405 Method Not Allowed :
The request method is known by the server but has been disabled and cannot be used. For example, an API may forbid DELETE-ing a resource. The two mandatory methods, GET and HEAD, must never be disabled and should not return this error code.

 ·         408 Request Timeout :
This response is sent on an idle connection by some servers, even without any previous request by the client. It means that the server would like to shut down this unused connection. This response is used much more since some browsers, like Chrome, Firefox 27+, or IE9, use HTTP pre-connection mechanisms to speed up surfing. Also, note that some servers merely shut down the connection without sending this message.

Server error (5XX)
The server failed to fulfill an apparently valid request.
·         500 Internal Server Error :
The server has encountered a situation it doesn't know how to handle.

·         501 Not Implemented :
The request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore that must not return this code) are GET and HEAD.

·         502 Bad Gateway :
This error response means that the server, while working as a gateway to get a response needed to handle the request, got an invalid response.

·         503 Service Unavailable :
The server is not ready to handle the request. Common causes are a server that is down for maintenance or that is overloaded. Note that together with this response, a user-friendly page explaining the problem should be sent. This response should be used for temporary conditions and the Retry-After: HTTP header should, if possible, contain the estimated time before the recovery of the service. The webmaster must also take care about the caching-related headers that are sent along with this response, as these temporary condition responses should usually not be cached.

·         504 Gateway Timeout :
This error response is given when the server is acting as a gateway and cannot get a response in time.

·         505 HTTP Version Not Supported :
The HTTP version used in the request is not supported by the server.

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